Here is the full list of all 9 Collapse Relapse achievements.
Complete the game
Collect 100% of the items and finish the game (any mode)
Escape with 50% items or less (not in randomizer)
Finish Designed Inverted Mode
Finish Vanilla Inverted Mode
Finish a game in randomizer mode
Complete special seed "Jump Countdown"
Complete special seed "4Dashes NoLegs"
Complete special seed "run faster plz"