This guide covers how to get to each achievement, as getting to each path isn't trivial, especially on disc 1.

If you just want the flowcharts, click here.

First of all, I strongly suggest mapping a button to turbo fire the circle button (I used triangle for that). It helps a lot against non-bosses and projectiles, and on discs 2 and 3, bosses too.

At the moment I'm writing this, there's only 1 guide on GameFAQs, and it should explain about the game well enough. I'll explain some things here, but for more info, you should check there as well.

• New game (はじめから)
• Continue (つづきから)
• Options (オプション)

Options don't have much; just watch cutscenes and change stereo/mono.

When in a battle, you can pause and do some things:

• First button is an energy tank; the number close to it is how many you have. They should refill when changing discs.
• The second button is to refill weapons (not fully though). They, along with the weapons themselves, should also replenish when changing discs.
• The third button is to check the database data.

Under that are the weapons you got so far; if you continue from a previous disc, you also keep all the weapons from them.

After you finish a disc, it will ask you if you want to save. Do so.

On the next disc, if you choose "continue", the game will ask if you want to continue from the previous disc's complete save data. If you say "yes" (はい), it'll show those saves, and only the completed ones will be highlighted.

If you choose "no" (いいえ), it'll show the current disc's saves.

On the 1st disc, the bosses have invincibility frames after you hit them, so spamming mega buster isn't as effective (though that's still effective to shoot down the projectiles). Using a charged buster or their weakness is usually better here.

However, on discs 2 and 3, that invincibility is gone for some reason. Because of this, your buster suddenly becomes everyone's weakness. Paired with Time Stopper (and later, Magnet Missile), all the damageless achievements become ridiculously cheesable.

However², you can only use Time Stopper 4 times (+ each weapon recharger) before all the energy is gone. So one strategy is to beat the boss damageless with Time Stopper, then reset and beat it again with other weapons, saving Time Stopper for the next bosses.

Clicking on the images should open their original size.

Any battle without a "lose" path should be a direct game over.