Guide by Paradise1

1) Synopsis / Table of Contents


Set Difficulty	2/10 to beat, 4/10 to master, click for details Beating the game is not very difficult, as many 90s kids will attest. Mastering the game is not that much harder. The tough achievements like Have Fun tend to be grindy rather than mechanically difficult.
Approximate time to master	25-40 hours with fast-forward (median time: 32.5 hours)
Minimum numbers of playthroughs needed	1
Number of missable achievements	21
Does difficulty affect achievements?	Not Applicable
Hardest achievement of the set	Gotta Catch 'em All

2) Introduction

Pokemon Red Version is one of the two Western releases of the first entries in the long-running Pokemon series. Originally released as Pokemon Red and Green in Japan in 1996, an updated version named Pokemon Blue was localized and released in the West in 1998 as the Red and Blue Versions we all know. Despite releasing very late into the Game Boy's lifespan, the games were a smash success, selling over 31 million copies worldwide (to this day, still the best-selling Pokemon games)! They were followed with an anime, a trading card game, and an unbelievable amount of merchandise, launching a multimedia empire that would grow to be the highest-grossing of all time.

Generation 1, as it's known, is beloved by fans for its relatively simple mechanics and classic Pokemon designs. The games hold up decently well today, although various QoL and balance changes made over the years mean that FireRed and LeafGreen may be a better experience if you've never played a Pokemon game before. Still, the games are by no means unplayable, and some even find that the unique mechanics of Generation 1 actually enhance the experience. In fact, this generation has a thriving competitive scene filled with players who love exploring the idiosyncrasies of the Generation 1 battle system.

This set, developed by Blazekickn and dude1286, is quite comprehensive, covering story progression, picking up items, defeating trainers, and, of course, catching 'em all! There are a few frustrating and grindy achievements, but with fast-forward (which I highly recommend) it's honestly not too bad. This was the first set I ever mastered, and I feel like it strikes a good balance difficulty-wise.

This guide doesn't have a beat-by-beat walkthrough, but I've linked a few excellent ones in the Useful Resources section if you'd like. I would also recommend checking out the Achievement Set Tips section for some pointers on the set as a whole. If you've never played Pokemon before, I've included a Pokemon Basics section. Feel free to read through it, or head straight to the Walkthrough to begin the game. As always, feel free to message me with any suggestions or corrections!

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Style Notes

I use the North American scheme for floor names. That is to say, the floor above the ground floor is the second floor, the floor above that is third, and so on.
I'll typically be spelling Pokemon without the accented e, just to make things easier for me (and to prevent weirdness with hyperlinks in some cases).
At the end of every section, I provide a link to Return to the Table of Contents, for easier navigation of the guide.

3) General Information

Pokemon Basics

If you've never played Pokemon before, this short video is an excellent introduction to the basic mechanics. Just note that some parts of it don't apply to Generation 1 - namely, Pokemon don't have Abilities, Pokemon can't hold items, and the Special Attack and Special Defense stats are a single stat called Special.

This section will pick up where that video left off and explain some intermediate mechanics of the Pokemon series (and this game specifically) that may prove helpful.

Keep the Type Chart handy to figure out what moves are super effective against what types. Note that the type chart has changed over the years, so make sure you're using the one specific to Generation 1.
When a Pokemon uses a move that matches its type (or one of its types, if it has two), it gains a Same-Type Attack Bonus (STAB), which multiplies the move's power by 1.5. This is a very significant boost.
Each Pokemon species has a set of Base Stats that range from 1-255 that determine what its stats will be. For instance, Chansey's base HP is 250, meaning it will have a lot of HP, but its base Attack is 5, meaning it will have a very low Attack stat. This makes certain Pokemon species suitable for certain roles.
- A Pokemon's Base Stat Total (the sum of all five stats) is a good approximation of how powerful they are. For instance, Weedle/Caterpie, the weakest Pokemon in the game, have BSTs of 175, while Mewtwo, the strongest Pokemon in the game, has a BST of 590.
- Typically, when a Pokemon evolves, its Base Stats will go up, making it more powerful.
There are two categories of moves: Physical and Special. Physical moves use the Attack stat of the attacking Pokemon and the Defense stat of the defending Pokemon. Special moves use the Special stat of both the attacking and defending Pokemon. In this generation, whether a move is Physical or Special depends entirely on its type.
- Normal, Fighting, Flying, Poison, Ground, Rock, Bug, and Ghost moves are all Physical.
- Fire, Water, Grass, Electric, Psychic, Ice, and Dragon moves are all Special.
- This means a few Pokemon have a disadvantageous combination of stats and typing. Take the Fire-type Arcanine, for instance - it has an impressive 110 Attack, but if it wants to use Fire-type moves for STAB, it has to use its relatively unimpressive 80 Special.
Whichever Pokemon has the higher Speed stat typically moves first. The only exception are moves that have a different "priority." In Generation 1, the only moves that have different priority are Quick Attack (which moves before all other moves), and Counter (which moves after all other moves). If two opposing Pokemon both use Quick Attack, the one with the higher Speed will move first, as normal.
- In this generation, Speed also affects how often you get a critical hit, doubling your damage. If a speedy Pokemon uses a high crit chance move like Slash, you can basically guarantee a critical hit!
Stat buffs and debuffs have twelve levels, six in each direction. Moves in this game will raise or lower a stat by either 1 or 2 stages. If it says a stat "greatly rose/fell", it's 2 stages, if it just says "rose/fell," it's 1 stage. Once a stat gets to +6 or -6, it can't be boosted higher or lower, respectively. The modifications to stats given by each stage are listed in the table below:

Stage	Multiplier
-6	Stat x .25
-5	Stat x .28
-4	Stat x .33
-3	Stat x .40
-2	Stat x .5
-1	Stat x .66
0	Stat x 1
1	Stat x 1.5
2	Stat x 2
3	Stat x 2.5
4	Stat x 3
5	Stat x 3.5
6	Stat x 4

There are five status effects in the game: Sleep, Paralysis, Burn, Poison, and Freeze.
- Sleep will prevent your Pokemon from moving until it wakes up. It takes a full turn to wake up in this generation, so if you're unlucky, you won't be able to get an attack in at all. Thankfully, sleep-inducing moves are somewhat inaccurate (except for Parasect's Spore).
- Paralysis will cut your Pokemon's Speed to a quarter of its normal value, and the Pokemon will have a 25% chance to not be able to move during a turn. Decreasing Speed also makes it harder to run away from battles. Paralysis doesn't go away naturally - you have to cure it using an item or go to a Pokemon Center. This condition is most often caused by Electric-type moves, but a few other moves can cause it too.
- Burn will cut your Pokemon's Attack in half, and your Pokemon will lose 1/16th of its max HP after every turn. Burn can be cured with items or by healing at a Pokemon Center. This status is caused by Fire-type moves.
- Poison simply decreases the affected Pokemon's HP by 1/16th at the end of each turn. Outside of battle, poisoned Pokemon will take 1 HP of damage for every four steps the player takes. Poison can be cured with items, or by healing at a Pokemon Center. Unsurprisingly, Poison is typically inflicted by Poison-type moves.
- Freeze prevents Pokemon from moving at all. In this generation, Pokemon will never unfreeze by themselves - they either have to be hit with a Fire-type move, or healed using items or a Pokemon Center. Thankfully, Freeze is relatively rare - it's only caused by Ice Beam and Blizzard, each with only a 10% chance of freezing the opponent.
If your Pokemon's stats are debuffed, you can restore them by switching out to a different Pokemon and switching back. If your Pokemon's stats are boosted, this will also reset them back to normal. This will also cure confusion, but will have no effect on status conditions like paralysis, sleep, freeze, or poison (with one exception)
- The exception is "bad" poison, caused by the move Toxic. Bad poison will increase the damage it does every turn (from 1/16th to 2/16ths to 3/16ths, and so on), but it can be converted to regular poison by switching out.
Status effects are very helpful in catching Pokemon, especially in this generation. Getting a Pokemon that learns Thunder Wave early (like Pikachu), will be a great help.
PP restoring items like Ethers and Elixers cannot be bought. Be careful about using them, as you may want to keep a few to make some achievements a little easier.

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Generation 1 Differences

A more exhaustive list can be found on this page. I'll note some of the more applicable differences here.
Perhaps the most major difference is the Special stat. In this game, Pokemon have a single Special stat which acts both as their attack stat when using Special moves, and as their defense stat against Special moves. This makes Pokemon with high Special absolutely busted.
Speaking of Special moves, moves in this game are Physical or Special based only on their type. Normal, Fighting, Flying, Poison, Ground, Rock, Bug, and Ghost moves are all Physical. Fire, Water, Grass, Electric, Psychic, Ice, and Dragon moves are all Special.
TMs in this game are single-use. Be careful about who you give them to.
Although there is a Pokemon Day Care south of Cerulean City, you can only put one Pokemon in there and can't breed Pokemon.
Pokemon cannot hold items.
Pokemon do not have abilities.
Item space is severely limited in this generation. In my opinion, this is the most annoying part about playing these games. Your Bag has space for 20 stacks of items (up to 99 items in each stack without glitches), and your PC has room for 50 more. This isn't enough room for every possible item, so you'll have to choose what to prioritize. For TMs, I would definitely recommend keeping TM03 (Swords Dance), TM13 (Ice Beam), TM24 (Thunderbolt), TM26 (Earthquake) and TM29 (Psychic) until the end of the game, as these are strong attacks that will be very useful for the Elite Four achievements. Otherwise, feel free to use or sell/toss TMs as you prefer.
If your Pokemon Box is full, you won't be able to catch additional Pokemon unless you head back to the PC and switch it yourself.
Some type interactions are different. Consult The Generation 1 Type Chart for details. Most notable are probably Poison being super effective to Bug (and vice versa, for whatever reason), and Ghost being completely ineffective against Psychic.
The balance between types is infamously lopsided in these games. In general, Psychic and Normal are very good due to their type matchups, strong attacks, and Pokemon with excellent stats. Many types which seem good on paper, such as Bug, Fighting, Ghost, and Dragon, have few good damaging moves, making them not very useful offensively. Ultimately, the game is easy enough to which you can make pretty much anything work, though, so don't be too discouraged.
Critical hits are based on Speed, not a fixed ratio. They deal approximately twice as much damage as a normal hit. They also ignore all stat changes of both the defender and the attacker, positive and negative, meaning that if a Pokemon's Attack is boosted enough, a non-critical hit can do more damage than a critical hit.
It takes one full turn to wake up from Sleep in this generation - the Pokemon won't attack on the same turn.
Freeze will never go away naturally in this generation. It can only be removed with items, being hit by a Fire-type move, or Haze.
There is no move reminder in this game, so if you overwrite a move, it's gone forever.
There's also no move deleter, which means that any HM moves you teach to a Pokemon cannot be overwritten by any means.
If you level up a Pokemon more than one level in one go, any moves learned on levels you skipped will not be learned.
If you attack a dual-type Pokemon with a move that one of its types is weak to and the other type resists, (e.g. hitting a Normal/Flying type with a Fighting move), the game will falsely state that the move is either super effective or not very effective instead of neutral. The actual damage calculation is unchanged, though. See this article for more specifics.
Finally, and perhaps most infamously, due to a programming error, every move has a 1/256 chance to miss, even if it's 100% accurate. This is known as a "Gen 1 Miss." The only exceptions are Swift and using an X Accuracy, which both allow you to bypass the bugged accuracy check entirely.

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Glitches

Pokemon Red is absolutely riddled with glitches. Several of these can be used to the player's advantage, such as the item duplication glitch which can let you obtain basically infinite money. Feel free to use these glitches if you'd like (it's not against the RetroAchievements rules), but I'll be writing this guide assuming that you won't be using any glitches. Not intentionally, at least. I also can't guarantee that achievements will work properly if you use glitches, so use them at your own risk.
Be careful catching any Pokemon you're not "supposed" to have (i.e. other starters, other eeveelutions)! This will likely lock you out of the Pokedex completion achievement. See the Gotta Catch 'em All guide in Catch 'em All Achievements for more details.

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Achievement Set Tips

You're going to want to spread out your XP a little bit to stay under the level cap for the gym leader achievements. You'll need to keep up with obtaining and evolving Pokemon anyway for the Oak's Aide achievements, so try and level up different Pokemon as you go!
You're definitely going to want to pick up every item and fight every trainer as you go. Nothing is more devastating than getting to the end and realizing you missed a single item or trainer somewhere. The Bulbapedia and zerokid guides linked in the next section have lists of items obtainable per area. The StrategyWiki guide and zerokid guide also have labeled maps (although not all of the StrategyWiki maps are labeled). Fabio Attard's checklist linked in the next section can also be very helpful for keeping track if you want to be methodical about it.
Once you jump down from Route 4 into Cerulean City, you won't be able to go back to Pewter or Viridian City until a little later in the game. Make sure you have everything you need for Misty's achievement beforehand.
I highly recommend you pick a Pokemon in the early or midgame to be an "EV friend" for the Where's My Ribbon? achievement. Full details on Stat EXP are in the Adventure Achievements section, but the short version is that the more battles you go through with your selected Pokemon, the less you'll need to grind at the end. I would recommend either your starter, Nidoking/Nidoqueen, Snorlax, Eevee, or Lapras.
- Whenever you get a Vitamin (HP Up, Protein, Iron, Calcium, Carbos), you should use them all on your EV Friend. Using the Vitamins will give you a good head start on maxing out a Pokemon's Stat Exp, but there's a maximum you can get to with Vitamins, so it's better to use them sooner rather than later. Plus, it saves bag space!
- Eventually, you're going to want a Pokemon who can solo the Elite 4, both for the Elite Stomp achievement and for grinding levels to evolve Pokemon for the Pokedex. This will also award lots of Stat EXP as well, so it might as well be your EV Friend. Saving good coverage TMs (Ice Beam, Thunderbolt, Earthquake, Psychic, etc.) for this point will make this easier.
In the comments of the Gym Leader challenge achievements, people seem to report having trouble unlocking them fairly often. To figure out why, I looked into the achievement code myself, and found (to the best of my knowledge) the three conditions that will prevent you from earning the achievements:
- If Shift Mode is on, it will prevent you from earning the achievement. You can turn Shift Mode into Set Mode in the in-game Options menu.
- While the gym music is playing (i.e. before the battle), if any Pokemon in your party is above the level cap, if will prevent you from earning the achievement. Even if you don't use them in the battle, it will still prevent you from earning it. However, if a Pokemon levels up beyond the cap during the battle it won't prevent you from earning the achievement, despite what the first forum post says.
- During the fight, if you use an item, it will prevent you from earning the achievement. It used to be that pressing A at all (even to hit cancel) in the item menu would prevent the achievement, but that is not the case anymore.
  - The achievement Smogon still uses this older logic to detect item use (as of time of writing), so be careful.
- Make sure you save before challenging the Gym Leader. The Gym Leader achievements now have challenge indicators in the corner which should appear when they send their first Pokemon out. If you don't see it, reset to your save and make sure that you have Set Mode on and no Pokemon in your party are above the level cap.
After you complete the Pokemon Tower, the game actually opens up quite a bit, and you can actually do Gyms out of order. In this guide, I've routed Silph Co. and Sabrina before Koga, as that's the route the Bulbapedia and StrategyWiki guides (linked below) follow. Feel free to do Koga first if you'd like! Just remember that the level cap is 43 for both of them, and that there's a missable achievement in the Safari Zone.

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Useful Resources

Bulbapedia is the most thorough and accessible source of Pokemon information out there. You can use it for Pokemon locations, learnsets, item locations, and more. Note that by default pages display information and movesets for the latest generation, which definitely won't be accurate for Generation 1. Usually there will be a button to view different generations, if applicable.
The Serebii Generation 1 Pokedex has thorough information on all Pokemon specific to Generation 1, and without extra information on things like the anime. If you want a more streamlined and Gen 1-specific experience than Bulbapedia, this is likely your best bet.
The Generation 1 Type Chart is worth keeping handy. There are several notable differences from later generations.
GitHub user Fabio Attard has created a checklist of all event flags in the game that is an absolute godsend for keeping track of all sorts of things for this run (Items, trainers, trades, gift Pokemon, etc.). If you feel like it would be helpful, feel free to print it out or paste it into a document and check off as you go. I'll be using sections of his checklist for the "collect all items in an area" achievements.
Smogon has a guide for all hidden items with pictures included. Very handy! I'll also use these images as appropriate.
Bulbapedia and StrategyWiki both have an excellent beat-by-beat walkthrough if you'd like to follow them. They also provide a list of items and trainers in each area to keep on top of those achievements. Bulbapedia lists the items in a single easy-to-parse box, while StrategyWiki tends to include them throughout the text, and has labeled maps for many areas. Choose which style you prefer. Bulbapedia also has the advantage of being specific to Red and Blue, whereas StrategyWiki includes Yellow, which may be slightly more confusing.
This GameFAQs guide by zerokid is also excellent, and additionally provides in-depth explanations of Gen 1 mechanics and glitches, and viability rankings for each Pokemon. It also has labeled maps for every area, which is excellent for keeping track of items and trainers.
The Cave of Dragonflies is a treasure trove of really in-depth information on Gen 1 mechanics, as well as every other generation. Of particular interest for this set are the Gen 1 Catch Rate Calculator and the Gen 1 Safari Zone Calculator.

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4) Walkthrough

Step 1: Story

In this section, we'll be going over the story of the game and grabbing missable achievements along the way. This part is separated into subsections by badge. Around the midpoint of the game, you can actually do things in a few different orders. I've decided to route Silph Co. and Sabrina's Marsh Badge before the Soul Badge, as that's what a few guides recommend. This might make it tough to find a specific achievement if it's not where you expect, so I would recommend using Ctrl-F to search for the achievement name.

In terms of missable achievements, the most common ones are for defeating Gym Leaders on Set Mode without items within a certain level cap. See the Achievement Set Tips for more specific details.

MISSABLE ACHIEVEMENTS:

Step 2: Elite 4 / Postgame

There are a few achievements for defeating the Elite 4 in special ways, so I'll group them in this section. If you kept at least a few great TMs, you should have no problem crafting teams to get through these conditions fairly easily. If not, there's no shortage of cheesy tactics you can use, so don't worry.

The only truly missable achievements in this section are for capturing Mewtwo without the Master Ball. You may want to keep Smogon in mind too, though, as you can definitely make that achievement harder than it needs to be if you don't prepare accordingly.

MISSABLE ACHIEVEMENTS

Step 3: Catch 'em All/Miscellaneous

This section will have multiple subsections. The first, Adventure Achievements, will detail achievements for collecting items, defeating Trainers, leveling Pokemon, and other miscellaneous things you may do while exploring the Kanto region. Catch 'em All Achievements will naturally have to do with completing your Pokedex. Game Corner Achievements cover winning and buying prizes at the Celadon Game Corner. Safari Zone Achievements cover the two achievements for catching Pokemon in the Safari Zone. Finally, Battle Achievements cover the achievements earned from fulfilling certain conditions in battle.

MISSABLE ACHIEVEMENTS

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Step 1: Story | Total points: 336

Boulder Badge

yes, that's really what he looks like in Red/Blue

As you begin the game, pick your starter. Bulbasaur is probably the easiest, as it makes the first two gyms easier, but pick whoever you prefer! After you fight Blue for the first time, go ahead and head north to Viridian City. Whatever you do, DO NOT catch any Pokemon yet, as that will lock you out of our first missable achievement. Don't even bother buying any Poke Balls. If you do, you can throw them away.

Free Points (1)
Get a free sample courtesy of the Viridian City Pokémon Mart.

As you head north to Viridian City, talk to the first person on your left to grab a free Potion.

Journey Has Started (5)
Obtain the Pokédex.

Grab Oak's Parcel from the Poke Mart in Viridian and bring it back, and Oak will give you the Pokedex.

The United Cities of Kanto (2)
Obtain a map of the Kanto region.

After getting the Pokedex, head to Blue's house north of the lab and his sister will give you the Town Map. After that, start training for the next rival fight, but remember - don't catch any Pokemon or buy any Poke Balls!

Parting Gift (5)
Obtain 5 Poké Balls from Prof. Oak.

MISSABLE

This achievement is missable if you capture more than one Pokemon (including evolving your starter) or if you have Poke Balls in your inventory.

In order to get Poke Balls from Oak, you'll have to defeat your rival on Route 22 west of Viridian City without buying Poke Balls and therefore without catching any additional Pokemon. Blue brings a level 9 Pidgey and a level 8 starter. Pidgey can be annoying to deal with, as it will use Sand-Attack and lower your accuracy, and you can't switch to a different Pokemon to restore your stats. If you're using Bulbasaur, Leech Seed can help give you an edge, as it will do passive damage even with lower accuracy. For Squirtle and Charmander, you can try and use STAB (same-type attack bonus) attacks like Bubble or Ember. For the starter, just use Tackle/Scratch (and Leech Seed with Bulbasaur) and hope for the best. I managed to get through at Level 10 with some luck, but you might need to go a bit higher. Just keep in mind that Brock has a Level 14 cap, and you also can't evolve your starter, as that would count as having captured another Pokemon.

Once you defeat Blue, go ahead and return to Professor Oak, who will give you a few Poke Balls and remind you what the point of the game actually is. After that, feel free to start catching Pokemon and filling up your team! Make sure you keep your starter at level 12 or 13 if you plan to use them during the Brock fight. At this point, you may want to catch 2 extra NidoranMs and an extra Spearow for in game trades later on, but you can save that for later too if you'd like.

(Thanks to MagicalChef1007, tinycyan, alcoatjez, lo9i, and others in the comments for their suggestions!)

Setting the Forest Ablaze (5)
Find every item and defeat every trainer in Viridian Forest.

Checklist

HIDDEN ITEM – Viridian Forest – Antidote

FIELD ITEM – Viridian Forest – Poké Ball
TRAINER BATTLE – Viridian Forest – Bug Catcher (Rick)
TRAINER BATTLE – Viridian Forest – Bug Catcher (Doug)
FIELD ITEM – Viridian Forest – Antidote
FIELD ITEM – Viridian Forest – Potion
HIDDEN ITEM – Viridian Forest – Potion

TRAINER BATTLE – Viridian Forest – Bug Catcher (Sammy)

Anybody Home? (5)
Without resetting, and without using Repels or Cut, get from one entrance of Viridian Forest to the other without initiating any wild encounters.

You don't have to get this on the first try, so if you run into a Pokemon, exit the forest and try again.

From Bulbapedia:

Basically, what you'll want to do, coming from the north side, is to walk through as few grass tiles as possible until you can take the white path the rest of the way. Starting from the north side lets you reset quicker if you run into an encounter.

Rock-Solid Boulder Badge (5)
Defeat Brock and earn the Boulder Badge in Pewter City.

Rock Smash (5)
Defeat Brock on Set Mode without using items in battle and without using Pokémon above level 14 at the beginning of the battle.

MISSABLE

This achievement is missable if you defeat Brock without the restrictions.

Rock Smash is our first Gym Leader challenge achievement. There are three conditions for unlocking it:

First, you must be in Set Mode, as opposed to Shift Mode. You can change this setting in the in-game Options menu. This will prevent you from switching to a new Pokemon when Trainers send out a new Pokemon, making the game slightly more difficult.
Second, you must not use any items during battle.
Finally, you must not have any Pokemon above the level cap (14 in this case) in your party before the battle starts. Even if you don't use them during the battle, having them in your party at all will prevent you from earning the achievement. However, going above the level cap during the battle is OK.

Make sure you save before challenging Brock. Once he sends out Geodude, you should see a challenge indicator for Rock Smash in the corner of the screen (assuming you have challenge indicators turned on in your emulator settings). If you don't see it, reset to your save and make sure you have Set Mode turned on and no Pokemon in your party that are above the level cap.

If you picked Squirtle or Bulbasaur, this battle is very easy. Brock has just two Pokemon: a level 12 Geodude, and a level 14 Onix. Both are 4x weak to Grass and Water. Bulbasaur learns Vine Whip at level 13, and Squirtle learns Bubble at level 8. If you picked Charmander, you might have a harder time. The best option is probably to evolve a Caterpie into a Butterfree and have it learn Confusion at Level 12. Geodude and Onix have pretty low Special, so any type of Special attack will take them out pretty easily.

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Cascade Badge

Make sure to buy the Magikarp in Mt. Moon Pokemon Center - it's considered to be a "gift" Pokemon (and at only 500 Pokedollars, it practically is a gift!).

Shoot for the Moon (5)
Find every item and defeat every trainer in Mt. Moon.

Checklist

TRAINER BATTLE – Mt. Moon B2F – Team Rocket Grunt
TRAINER BATTLE – Mt. Moon B2F – Team Rocket Grunt
HIDDEN ITEM – Mt. Moon B2F – Moon Stone

TRAINER BATTLE – Mt. Moon B2F – Super Nerd (Miguel)

Make sure you keep the Moon Stones you get in here. There are only five in the game, and you'll need to use them on four different Pokemon to complete the Pokedex (Those being Nidorino, Nidorina, Jigglypuff, and Clefairy). You can also directly capture Jigglypuff's evolution Wigglytuff later on, though.

Only Take One (5)
Choose the Helix Fossil or the Dome Fossil at the end of Mt. Moon.

You can take whichever you want. You won't be able to revive them until much later in the story, so it probably doesn't matter too much, but I think Omastar is better, strictly speaking.

Again, once you jump down into Cerulean City, you won't be able to return to Pewter or Viridian City (unless you death-warp to the last Pokemon Center you used), so make sure you're ready to take Misty down!

Raindrop Cascade Badge (5)
Defeat Misty and earn the Cascade Badge in Cerulean City.

Pool's Closed (5)
Defeat Misty on Set Mode without using items in battle and without using Pokémon above level 21 at the beginning of the battle.

MISSABLE

This achievement is missable if you defeat Misty without fulfilling the conditions.

Misty has a level 18 Staryu and a Level 21 Starmie. Starmie is probably the biggest threat we've faced so far, as it has quite high stats, especially Special and Speed. If you have an Ivysaur, Misty probably won't give you too much trouble. If not, here are some suggestions:

A Pikachu from Viridian Forest (assuming you caught one) would probably be your best bet. As supersharpy64 and Vespidcrown note in the comments, you can try and land a Thunder Wave to paralyze Starmie to prevent it from outspeeding all of your Pokemon, allowing them to finish the KO if Pikachu goes down.
You could also use one of the Moon Stones you picked up in Mt. Moon to get an early Nidoking evolution. Nidoking has very good stats for this part of the game. However, his Ground typing leaves him weak to Water moves, so you might have to bring something else to finish the job,
Magikarp evolves at level 20, and Gyarados' massive 125 Attack stat combined with its Water resistance will take down Starmie without too much trouble.
If all else fails, you can grab a Spearow and/or Rattata from Route 4 and evolve them at level 20. Raticate's Hyper Fang will put in work.
You could even try and cheese with Ekans' Wrap (assuming Starmie is paralyzed, so you outspeed it), which will slowly but surely get you the win.
Another cheesy strategy would be to use Pidgeotto's (or Sandshrew's) Sand-attack to lower Starmie's accuracy, as Slackot suggests in the comments.

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Thunder Badge

After defeating Misty, there's not much else to do in Cerulean right now. There's a trainer wanting to trade Poliwhirl for Jynx, but you probably don't have a Poliwhirl yet, so that will have to wait. Head north to Route 24, defeating Blue and the trainers on the Nugget Bridge. On Route 24, you may want to catch an extra Abra if you can for an in-game trade later. Once you rescue Bill, return to Cerulean City and head south on Route 5 to get to Vermilion City. In the north gate of the Underground path, there's a girl offering a NidoranF for a NidoranM. Not the most exciting deal, but it's required for an achievement, so go ahead and do it if you have an extra NidoranM.

Once you get to Vermilion City, there's another trade available - Farfetch'd for Spearow. Go ahead and do it if you have a Spearow you're willing to part with. Farfetch'd is not very strong, but makes a decent HM friend, as it can use Cut and Fly. In any case, both the trade and Farfetch'd are required for achievements. If you want to catch an extra Spearow, the closest place is Route 4, west of Cerulean.

You'll also want to grab the Old Rod and the Bike Voucher while you're here.

I Like to Ride It (5)
Obtain the Bicycle from the Bike Shop in Cerulean City.

Once you get the Bike Voucher by listening to the old man in the Pokemon Fan Club north of the Vermilion Gym, you can head back to Cerulean City and obtain the Bike. There's no pressing need, though, so you can do it later if you'd like.

Once you're ready, head to the S.S. Anne. Note that once you get the HM01 Cut from the Captain and then leave the ship, it will sail off, never to return. This makes a few achievements missable, so make sure you don't pick up Cut until you're ready! Before you pick up Cut, you can enter and exit the ship as many times as you'd like, though.

Also keep in mind that Lt. Surge's level cap is only 24, so make sure you're spreading experience out (or be ready to leave some Pokemon in the PC).

Sleeping Giant (2)
Be told about a legendary Pokémon that sleeps a lot.

MISSABLE

This achievement is missable if you fail to talk to the man before the S.S. Anne departs.

The man who tells you about Snorlax is located on the second floor, in the leftmost cabin.

My Heart Will Go On (10)
Collect every optional item and defeat every optional trainer on the S.S. Anne.

MISSABLE

This achievement is missable if you don't collect all the items and fight all the trainers before the S.S. Anne departs.

Checklist

TRAINER BATTLE – S.S. Anne B1F – [Missable] Fisherman (Barny)
TRAINER BATTLE – S.S. Anne B1F – [Missable] Sailor (Phillip)
HIDDEN ITEM – S.S. Anne B1F – [Missable] Hyper Potion

TRAINER BATTLE – S.S. Anne Deck – [Missable] Sailor (Trevor)
TRAINER BATTLE – S.S. Anne Deck – [Missable] Sailor (Edmond)
TRAINER BATTLE – S.S. Anne 2F – [Missable] Fisherman (Dale)
TRAINER BATTLE – S.S. Anne 2F – [Missable] Gentleman (Brooks)
FIELD ITEM – S.S. Anne 2F – [Missable] Max Ether
TRAINER BATTLE – S.S. Anne 2F – [Missable] Gentleman (Lamar)
TRAINER BATTLE – S.S. Anne 2F – [Missable] Lass (Dawn)
FIELD ITEM – S.S. Anne 2F – [Missable] Rare Candy

Make sure you get all of them before you get HM01 Cut!

A Boatload of Fun (5)
Rub the Captain's back on the S.S. Anne and obtain HM01 Cut.

Once you get Cut, make sure that you have picked up all the items and battled all the trainers you need to. The S.S. Anne will depart as soon as you exit.

Be careful about teaching Cut - in this game, HMs cannot be overwritten by any means, so it's probably best to designate 1 Pokemon as an HM friend (like Farfetch'd) so you don't have to put Cut on your stronger Pokemon.

Cut opens up a lot for us, but since we're in Vermilion, let's go ahead and challenge Lt. Surge's gym first.

Sunny Thunder Badge (5)
Defeat Lt. Surge and earn the Thunder Badge in Vermillion City.

One Man Army (5)
Defeat Lt. Surge on Set Mode without using items in battle and without using Pokémon above level 24 at the beginning of the battle.

MISSABLE

This achievement is missable if you defeat Lt. Surge without fulfilling the conditions.

Lt. Surge has a level 21 Voltorb, level 18 Pikachu, and level 24 Raichu. Raichu in particular is a threat with it's Thunderbolt and high Special. Here are a few strategies to get by.

As blood and Dragonskhan mention in the comments, Ground types will completely wall Raichu. If you need one, you can head east of Vermilion to Diglett's Cave to grab a Diglett. You can also find level ~30 Dugtrio, but they are above the level cap. Watch out for Screech from Voltorb and Quick Attack from Pikachu, though. If you have 2 Ground Pokemon, you should be in the clear.
Ivysaur (and other Grass types) resists Electric moves (Bulbasaur fans stay winning), allowing you to whittle down the first two Pokemon.

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Rainbow Badge

After defeating Surge, head east to Route 11.

Lawn Mower (2)
Cut the grass.

When you're next to tall grass, you can use Cut to clear a patch of it, allowing you to (very tediously) walk risk-free through a route. Probably not all that useful, but it's a neat feature!

Metal Detector (5)
Obtain the Itemfinder from Prof. Oak's aide on Route 11.

The Aide is found on the second floor of the gate on the east side of route 11. If you have caught 30 types of Pokemon, he'll give you the Itemfinder. Next to him is a guy who will trade Nidorina for Nidorino. Again, unimpressive, but it's required.

You can't head east any more because Snorlax is blocking the way, so head through Diglett's Cave back to Route 2. South of the exit onto Route 2 is a house where a kid will offer his Mr. Mime for an Abra. This is the only way to get Mr. Mime, so trade an Abra if you have an extra one.

Flashing Lights Warning (5)
Obtain HM05 Flash from Prof. Oak's aide on Route 2.

Further south, there's another gate where an Aide will give you HM05 Flash if you've caught at least 10 types of Pokemon. Again, HMs can't be overwritten in this game, so be careful about who you teach it to.

After getting Flash, there aren't any achievements until you reach Celadon City. You can use Cut to get TM42 (Dream Eater) in Viridian City and the Old Amber from the Pewter Museum on the way.

Once you reach Celadon, you can pick up Eevee through the back door of the Pokemon Mansion, visit the Department Store (make sure to get an extra drink for the guard and at least 2 Poke Dolls), and challenge Erika at the Celadon Gym.

Floral Rainbow Badge (5)
Defeat Erika and earn the Rainbow Badge in Celadon City.

Kicking Some Grass (10)
Defeat Erika on Set Mode without using items in battle and without using Pokémon above level 29 at the beginning of the battle.

MISSABLE

This achievement is missable if you defeat Erika without fulfilling the conditions.

Erika has a level 29 Victreebell, a level 24 Tangela, and a Level 29 Vileplume. Victreebell and Vileplume are probably the biggest threats - they can put you to sleep with Sleep Powder, which really sucks in Gen 1. Here's some suggestions:

Charmander users finally get their first W (and Bulbasaur boys their first L). Charmeleon should have no problem ripping through Erika's Pokemon.
You can also grab a Growlithe/Vulpix on Route 8 east of Saffron City or Route 7 east of Celadon.
Kadabra will make short work of Victreebell and Vileplume due to their Poison typing. Kadabra learns Psybeam at level 27, and should outspeed to avoid Sleep Powder if your level is high enough.
You can use your Flash Pokemon to lower the accuracy of Sleep Powder even further if you'd like.

After defeating Erika, we'll have to go tackle the Rocket Hideout and the Pokemon Tower.

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Marsh Badge

The Rocket Hideout is located within the Celadon Game Corner. You could try a few of the Game Corner achievements, or you could wait until later when you have more funds.

Raiding the Vault (5)
Find every item and defeat every trainer in the Rocket Hideout.

Checklist

TRAINER BATTLE – Rocket Hideout B1F – Team Rocket Grunt
FIELD ITEM – Rocket Hideout B1F – Escape Rope
TRAINER BATTLE – Rocket Hideout B1F – Team Rocket Grunt
HIDDEN ITEM – Rocket Hideout B1F – PP Up

Ghost Buster (5)
Obtain the Silph Scope from the Rocket Hideout.

Now that you've gone to all that effort to get the Silph Scope, go ahead and put it (and the Lift Key) into your PC, as an achievement in the Pokemon Tower requires you to pass the ghost without using the Silph Scope. Before you head back to Lavender Town, take a short detour to the west, onto Route 16. This will allow you to grab Fly, which will be very useful.

Prepare For Liftoff (5)
Obtain HM02 Fly from the secret house on Route 16.

Snorlax will be blocking the entrance to Route 16 proper, but you can Cut a tree to go through the northern path instead. Doing so, you'll find a house with a woman who will give you the Fly HM! If you brought an HM friend like Farfetch'd, you can teach it to them now, and Fly straight to Lavender Town. Otherwise, you can walk back to Celadon and go east, potentially unlocking the gates to Saffron City by giving the guards a drink item.

Before you head into the Pokemon Tower, make sure you bring a Poke Doll, and leave the Silph Scope in the PC. If you don't have a Poke Doll, you can buy one on the 4th floor of the Celadon Department Store.

Grave Robbing (5)
Find every item and defeat every trainer in the Pokémon Tower.

Checklist

Dearly Beloved (5)
Gift the Ghost at the top of Lavender Tower a Poké Doll to calm it without using the Silph Scope.

MISSABLE

This achievement is missable if you defeat the Ghost normally with the Silph Scope.

If you encounter the Ghost at the top without a Silph Scope in your inventory, you can use the Poke Doll item to immediately end the fight. Due to a programming oversight, this counts as defeating the Ghost, allowing you to progress!

GHOST!? (5)
Save Mr. Fuji and obtain the Poké Flute.

After getting to the top floor and rescuing Mr. Fuji, make sure you talk to him so he'll give you the Poke Flute. If you'd like, you can go back into the Pokemon Tower with the Silph Scope to catch Gastly and Cubone.

At this point, you actually have a few options. For your next badge, you could challenge Silph Co. and Sabrina in Saffron City or Koga in Fuchsia City. The level cap for both gyms is 43, so there's a lot of room to train Pokemon up. I'll be following the order in the Bulbapedia and Strategy Wiki guides, which both do Sabrina first.

When you get to Saffron, there's not much you can do, as Team Rocket has taken control of the city. Our ultimate goal is Silph Co., but if you want, you can challenge the Fighting Dojo beforehand.

Enter the Dragon (5)
Claim your prize from the Saffron City Dojo.

The Dojo is the building that says GYM right next to the regular gym. You'll face five Black Belts, who all have Fighting type Pokemon. A Psychic type like Kadabra will make short work of them. Once you defeat them, you can choose Hitmonchan or Hitmonlee. Hitmonlee is probably slightly better, as the elemental punches that Hitmonchan learns are Special attacks, and Hitmonchan's Special is an abysmal 35.

Next, we'll fight through Silph Co. Make sure you save before you enter, as there's a missable achievement that requires you to "sneak" your way through.

Ekans Dilos (5)
Reach the Rival in Silph Co. without defeating more than 1 trainer.

MISSABLE

This achievement is missable if you encounter more than the required one trainer.

Here are step-by-step instructions, adapted from MarvellousDazza's guide in the comments:

Enter the front door, and head straight to the elevator at the back. Head up to the 5th floor.
Walk left until you see two plant pots. Head south of them to avoid a Trainer to the west, and then follow the hallway south to the bottom.
There should be a Rocket Grunt standing next to a teleport pad. This is our one mandatory encounter - defeat him, then use the teleporter pad. Teleport back the way you came, and you should be able to folllow the hallway south and east to grab the Card Key.
Once you grab the Card Key, open the door to the northeast of the Rocket Grunt you just defeated. Inside that door, to the south of the boxes, is another teleporter. Take that one.
Follow the hallway east and turn north as soon as you're able to. There will be a door on the west side of the hallway - go through that door, and step on the teleporter, and the fight with Blue should start, giving you the achievement!

Once you earn this achievement, do note that you'll have to go back and battle all the trainers you missed before you fight Giovanni in order to get the next achievement.

Hostage Situation (25)
Find every item, defeat every trainer, and open every door in Silph Co.

MISSABLE

This achievement is missable if you don't defeat all of the trainers before you defeat Giovanni. The items and doors will still be accessible, though!

Note that the Trainers will disappear once you defeat Giovanni. As Grahamtams says in the comments, Giovanni will challenge you immediately when you walk through his door, so make sure that you've gotten everything before you do! The Blue fight, picking up Lapras, the Giovanni fight, and the Master Ball don't count towards this achievement, so it should pop as soon as you open the last door to Giovanni.

Checklist

Biggest Balls In Kanto (5)
Obtain the Master Ball from the President of Silph Co.

You'll receive the Master Ball after defeating Giovanni. Once you're done, a few things open up - you can use a Poke Doll to get TM31 Mimic, and you can challenge Sabrina's gym.

Golden Marsh Badge (10)
Defeat Sabrina and earn the Marsh Badge in Saffron City.

Brawn Over Brains (10)
Defeat Sabrina on Set Mode without using items in battle and without using Pokémon above level 43 at the beginning of the battle.

MISSABLE

This achievement is missable if you defeat Sabrina without fulfilling the conditions.

Sabrina can be tough, as Psychic has no good counter in this game. What's more, Kadabra and Alakazam often like to use Recover, wiping out any progress you may have made. Enemies don't have PP in this game, so they can use Recover indefinitely. Here's a few suggestions:

As NimbusSpark suggests, Snorlax is a good option. You can catch one using the Poke Flute (detailed in the next section). Snorlax comes knowing Amnesia, which boosts Special by two stages. After KOing Kadabra, Snorlax can buff up its defenses with Amnesia, and then take down the rest of the Pokemon using Body Slam (learned at level 35), exploiting their relatively weak physical defense.
Raichu, Jolteon, or Electrode could use Thunder Wave to paralyze Alakazam, lessening the chance that it will successfully use Recover.
As rickyplays suggests, you can grab a Dugtrio from Diglett's Cave and use Dig.
Dragon Rage (from Gyarados or Charizard) is still a decent option for guaranteed damage.
If all else fails, you can use Double Team to cheese the fight. TM32 Double Team is buyable at the Department Store, and can be taught to almost every Pokemon in the game (Metapod fans in shambles). Mr. Mime is a decent Pokemon to set up on.

Monkey's Tounge (5)
Starting from the gym entrance, navigate through the Saffron City Gym using only 4 warps.

You don't need to do this on the first try - you can come back after you defeat Sabrina.

As several users state, the solution is (after taking the first warp) to take the northwest portal, the southwest portal, and the southwest portal again.

After you defeat Sabrina, get ready to head down to Fuchsia City.

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Soul Badge

There are a couple ways to get to Fuchsia City. West of Celadon City is Cycling Road, spanning Routes 16, 17, and 18. This Route is quick to traverse, has a bunch of hidden items, and a trade (Slowbro for Lickitung) on Route 18. You probably don't have a Slowbro yet, but you'll need to come back when you do.

Meanwhile, south of Lavender Town are Routes 12, 13, 14, and 15. These routes have a long gauntlet of Trainers, which takes longer, but you can get a bunch of XP. Route 12 also contains a house with the Super Rod. Choose whichever way you prefer. Or choose both!

The Sleeper Awakens (5)
Use the Poké Flute to awaken and catch a Snorlax.

MISSABLE

This achievement is missable if you KO both of the Snorlaxes.

Whichever way you go, a sleeping Snorlax will be blocking the way. Use the Poke Flute to awaken them, and then battle and catch them.

Note that if you KO Snorlax, it won't respawn, which is what makes this achievement missable. Thankfully, there are two Snorlaxes, so if you miss one, you can try and catch the other. I would still recommend saving beforehand though, just to be safe.

Snorlax is a very good Pokemon in Gen 1. With its high Attack, it can use Normal-type STAB moves like Body Slam, Double-Edge, and Hyper Beam very effectively. Its Special of 65 is just OK, but with access to Amnesia, which boosts Special by 2 stages, Snorlax can become very tanky, and even dish out some major Special damage of its own with moves like Surf.

In the gate from Route 15 east of Fuchsia City, you can grab two achievements:

Sharing Is Caring (5)
Obtain an Exp. All from Prof. Oak's aide in Fuchsia City.

Oak's Aide can be found on the second floor of the gate. If you've caught 50 species of Pokemon, you can get the EXP. All, an item that splits EXP evenly between different Pokemon in your party while it's in your bag. This can be useful for making sure your Pokemon stay under a level cap, or for leveling up multiple species of Pokemon to evolve them.

Unidentified Flying Object (2)
Glance at a mysterious bird in the distance using the binoculars.

Also on the second floor of the gate are two pairs of binoculars. One of them will show a bird flying in the distance, and will bring up a picture of Articuno.

You can still get this even after you've caught Articuno - the bird will still appear in the binoculars. Must be its cousin.

Once you enter Fuchsia City proper, you can either head straight for the Gym or do some exploring first.

Froggy! (5)
Obtain all 3 Fishing Rods.

If you got the Old Rod in Vermilion City and the Super Rod from the house on Route 12, then you can get this achievement by getting the Good Rod from the house directly to the east of the Warden's.

Heart and Soul Badge (10)
Defeat Koga and earn the Soul Badge in Fuchsia City.

Ninja Gaiden (10)
Defeat Koga on Set Mode without using items in battle and without using Pokémon above level 43 at the beginning of the battle.

MISSABLE

This achievement is missable if you defeat Koga without fulfilling the conditions.

After Sabrina, Koga's not so bad. All four of his Pokemon are pure Poison type, so a Psychic type Pokemon can rip him to shreds. The only potentially annoying things are his Muk using Minimize, or his Weezing using Selfdestruct (although at that point you've already won). Here are some tips:

Kadabra is perfect for this challenge, especially since it learns the incredibly powerful Psychic at level 38. It will likely be able to outspeed and one-shot all of Koga's Pokemon, avoiding the Minimize issue from Muk.
A Ground Pokemon can be good, using either Dig or Earthquake. Graveler learns Earthquake at level 36, and Diglett learns it at level 40 (if you delay the evolution). You can also use the Earthquake TM you got in Silph Co., but you may want to hang onto it until the Elite 4 instead (or be careful about who you give it to).
Snorlax learns the powerful move Body Slam at level 35, and is a decent option. If you get unlucky, Muk might stack more than one Minimize, though.

Ace of the Maze (5)
Starting from the gym entrance, navigate through the Fuchsia City Gym without hitting any walls.

This one isn't missable - you can retry by exiting the Gym and entering again. If you look closely, you can see the pattern of the invisible walls on the floor, so it shouldn't be too hard to avoid. As Earthsouls and Sebta mention, hitting walls, trainers, and the edge of the map will void the achievement. Basically, if you hear the "bonk" sound, it voids the achievement. As Vespidcrown suggests, go slowly and tap the button to go one space at a time if you need to.

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Volcano Badge

Before entering the Safari Zone, empty out your bag so that you have at least 12 open slots. There are ten optional items you'll need to collect in one run, and two quest items. You need Surf to get one of the items, so you may want to get Surf on the first trip and get the rest on a subsequent trip. If you have a good route, you can get all of them in one trip assuming you've beaten Koga and bring a Pokemon who can learn Surf. You can see an example in this video by OmegaVideoGameGod.

Too Much Water (5)
Obtain HM03 Surf from the Safari Zone.

Surf is found in a house in the western area. You'll have to loop around through the east and northern areas to get there, though. While you're there, you can also pick up the Gold Teeth if you'd like but don't pick up any other items, as you'll need to get the rest in one visit. If you want, with the rest of your time you can try fishing for Magikarp with the Old Rod for Getting Your Money's Worth (see the Safari Zone Achievements).

No Item Left Behind (10)
Without resetting, collect all optional items in the Safari Zone within a single Safari Hunt.

MISSABLE

This achievement is missable if you obtain any optional items and exit the Safari zone without collecting all of them.

Make sure you save before entering the Safari Zone, and that you have space in your bag for all the items.

There are ten optional items in the Safari Zone. Try to take them area by area. zerokid's guide has excellent maps of each area.

FIELD ITEM – Safari Zone Center – Nugget
FIELD ITEM – Safari Zone East – Carbos
FIELD ITEM – Safari Zone East – Max Potion
FIELD ITEM – Safari Zone East – TM37 (Egg Bomb)
FIELD ITEM – Safari Zone East – Full Restore
FIELD ITEM – Safari Zone North – TM40 (Skull Bash)
FIELD ITEM – Safari Zone North – Protein
FIELD ITEM – Safari Zone West – TM32 (Double Team)
HIDDEN ITEM – Safari Zone West – Revive

FIELD ITEM – Safari Zone West – Max Potion
FIELD ITEM – Safari Zone West – Max Revive

Performance Enhancement Disk (5)
Obtain HM04 Strength from the Safari Zone Warden in Fuchsia City.

After your adventure in the Safari Zone, give the Gold Teeth to the Warden in his house east of the Pokemon Center. He'll give you the HM04 Strength in return. Make sure you grab the item that's nearby!

Slowpoke is a decent choice for a second HM Friend - it can learn Strength, Surf, and Flash. You can grab one in the Safari Zone (if you're not sick of it yet), or a higher-leveled one in the Seafoam Islands coming up.

Now that you have Surf, you can either head on to the Seafoam Islands, or you can backtrack to the Power Plant on Route 10, east of Cerulean City. In both locations you can capture a legendary bird Pokemon - Articuno and Zapdos, respectively. The easiest way to catch legendary Pokemon in this game is to inflict them with a status and chuck Ultra Balls. Sleep is ideal, but even Paralysis gives a ~10% catch chance at full HP. Don't worry too much about trying to get them to low HP - the increase to catch chance is pretty marginal compared to inflicting them with a status. Alternatively, you could use the Master Ball on one of them, as we won't be using it for Mewtwo. Whatever you do, make sure you save before you battle them - if you KO them, they won't come back!

If you do end up going to the Power Plant, make sure you battle and defeat (or catch) the Voltorbs and Electrodes disguised as items - clearing them all is required for an achievement.

Finally, you may want to keep Articuno and Zapdos in the box for now. Not only are they above the level cap, but them coming at level 50 makes them ideal as a Plan B (or Plan A) for the Smogon achievement (which also has a level cap of 50).

Cinnabar Island has a bunch of things to do. First of all, you can head to the Pokemon Lab, which contains a scientist who can revive your fossil Pokemon! If you've received every other gift Pokemon so far, the It's Present achievement should pop. The lab also contains our final three in-game trades for No ~Multi~ Set Required. The three trades are Venonat for Tangela, Raichu for Electrode, and Ponyta for Seel. Venonat can be caught in a lot of places, and Ponyta can be caught in the Pokemon Mansion here on Cinnabar Island. If you don't want to evolve your own Raichu, you can find wild Raichu in Cerulean Cave in the postgame. Full details for these two achievements are located in Adventure Achievements.

Once you're ready, head into the Pokemon Mansion.

GB Bungaku Zenshuu (5)
Without resetting and without leaving the building, read every journal in the Cinnabar Mansion.

There are two journals on the second floor, one on the third floor, and one in the basement.

Once you finish the Pokemon Mansion, make sure you save before you enter the gym - unlike Sabrina and Koga, there is a MISSABLE gym achievement!

2000 IQ Super Quiz (5)
Without resetting and without leaving the building, complete all of the quizzes in the Cinnabar Island Gym without fighting any trainers.

MISSABLE

This achievement is missable if you answer any questions incorrectly, fight any of the trainers, or leave the gym after answering any questions.

You'll need to get all of the quiz answers correct in one go. Don't save in between them - if you accidentally get one wrong, reload your save from before the Gym!

MarvellousDazza shares the answers:

Yes (as IanJ1988 notes, this is debatably incorrect, as Caterpie evolves into Metapod, not Butterfree)
No
No
No
Yes
No

Once you answer the sixth question, the achievement will pop. At this point, you can go back and talk to the trainers to challenge them if you'd like. They're not required for any achievements, though, so you can just go ahead and fight Blaine if you'd like.

Fiery Volcano Badge (10)
Defeat Blaine and earn the Volcano Badge at Cinnabar Island.

Fire Fighter (10)
Defeat Blaine on Set Mode without using items in battle and without using Pokémon above level 47 at the beginning of the battle.

MISSABLE

This achievement is missable if you defeat Blaine without fulfilling the conditions.

Blaine has four Pokemon: a level 42 Growlithe, a level 40 Ponyta, a level 42 Rapidash, and a level 47 Arcanine. All are pure Fire-types, so their weakness should be easy to exploit:

To be honest, basically any Water type with Surf can take Blaine down. I managed to do it with a level 38 Slowbro without setting up at all. You can easily catch a suitable Pokemon in Seafoam islands.
Surf is pretty widely teachable, so even Pokemon like Snorlax or Nidoking can get in on the action. Just remember that you can't overwrite it.
Ground and Rock type Pokemon are also an option. Earthquake will easily take down Blaine's team.

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Earth Badge

spoilers, I guess

There's not much else to do at this point besides heading back to Viridian City to challenge the final Gym Leader. Either Surf north from Cinnabar to return to Pallet Town, or Fly straight to Viridian, and get ready for our final Gym Challenge.

Feathered Earth Badge (10)
Defeat Giovanni and earn the Earth Badge in Viridian City.

Blasting off Again (10)
Defeat Giovanni in the Viridian Gym on Set Mode without using items in battle and without using Pokémon above level 50 at the beginning of the battle.

MISSABLE

This achievement is missable if you defeat Giovanni without fulfilling the conditions.

Giovanni brings a level 45 Rhyhorn, a level 42 Dugtrio, a level 44 Nidoqueen, a level 45 Nidoking, and a level 50 Rhydon. Here are some tips:

Water Pokemon are again likely your best bet. Surf will wreck Giovanni's team, especially Rhyhorn and Rhydon who are 4x weak to it.
Grass Pokemon like Venusaur aren't too bad either, although they may struggle against Nidoking and Nidoqueen due to their Poison typing.
As always, Kadabra is a great choice, especially for Nidoqueen and Nidoking who are weak to Psychic type attacks.

From StrategyWiki:

One of a Kind (2)
Grab the only item in the game that is inside of a Gym.

There is a Revive tucked in a hallway to the right of the central area, as shown in the picture above.

Spin to Lose (5)
Starting from the gym entrance, navigate through the Viridian City Gym without using any spin tiles.

To do this, you'll have to go through the central area, past Trainer 4 and Trainer 5. Note that Trainer 5 will block your path, so you'll need to exit the Gym and enter again to reset him. This achievement isn't missable - you can get it after defeating the gym.

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Victory Road

We're in the home stretch! Head west of Viridian City to battle your Rival one more time and then head up to Victory Road.

If you can, try and keep a few Pokemon below Level 50 for the Smogon achievement. Conveniently, the legendary birds come at Level 50, so if you keep them in the Box for now, that serves as a decent backup plan if one of your Pokemon goes over.

Victory Lap (10)
Find every item and defeat every trainer in Victory Road.

Checklist

FIELD ITEM – Victory Road 2F – Guard Spec.
HIDDEN ITEM – Victory Road 2F – Full Restore

TRAINER BATTLE – Victory Road 3F – Cooltrainer♂ (George)
FIELD ITEM – Victory Road 3F – TM47 (Explosion)
TRAINER BATTLE – Victory Road 3F – Cooltrainer♀ (Caroline)
FIELD ITEM – Victory Road 3F – Max Revive
TRAINER BATTLE – Victory Road 3F – Cooltrainer♂ (Colby)
TRAINER BATTLE – Victory Road 3F – Cooltrainer♀ (Alexa)

You can also find Moltres on 2F to complete the Uno, Dos, Tres! achievement.

Once you reach the Indigo Plateau, take a minute to take stock of your Pokemon and remaining TMs to build a team for the Elite 4 achievements.

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Step 2: Elite 4/Postgame| Total points: 95

Elite 4

Pokémon Master! (25)
Beat the Elite Four and the Champion of the Pokémon League.

There are five Elite Four achievements - one for just beating them, and four for beating them under specific conditions. The latter four you can overlap without too much trouble, or you can tackle them individually to make it easier. I'll go through each one individually.

If you've been saving your TMs, now's the time to use them. Having a wide variety of moves on one Pokemon (li

Pokemon Red Version (Game Boy) - RetroAchievements/guides GitHub Wiki

1) Synopsis / Table of Contents

Table of Contents (click to expand)

2) Introduction

Style Notes

3) General Information

Pokemon Basics

Generation 1 Differences

Glitches

Achievement Set Tips

Useful Resources

4) Walkthrough

Step 1: Story | Total points: 336

Boulder Badge

Cascade Badge

Thunder Badge

Rainbow Badge

Marsh Badge

Soul Badge

Volcano Badge

Earth Badge

Victory Road

Step 2: Elite 4/Postgame| Total points: 95

Elite 4