Here is the full list of all 10 Achromira achievements.
Used the Fireball 100 times
Used the Vinehook 100 times
Completed Stage 2 : Gryd
Completed all stages with all 50 crystals collected
Used the Glitch-Shift 500 times
Completed Stage 1 : Rutate
Collected all 50 crystals in Rutate
Started the game for the first time
Completed Tutorial : Achrome
Collected all 50 crystals in Gryd