Full list of all 20 Abyss achievements worth 200 gamerscore. It takes around 3-4 hours to unlock all of the achievements on Windows.
Get 2 Gaias in less than 5 seconds
Get 3 Gaias in less than 15 seconds
Gather your first Gaia
Gather 25% of the Gaia
Gather 50% of the Gaia
Gather 75% of the Gaia
Gather 100% of the Gaia
Die for the first time.
Die 10 times in the same level.
Beat a level after crashing 5 times.
Die 10 Times by a saw
Die 10 times by a rock
Die 100 Times
Complete the tutorial
Gather all 6 pieces of the first Nep2no vessel
Beat game using minimum brightness settings
Finish your first Abyss level
Finish your first Nightmare level
Beat all Abyss levels
Beat all Nightmare levels