Here is the full list of all 33 SOMOS achievements.
Complete Finale
Complete Boss 3
Complete Boss 2
Complete Boss 1
Complete Speedrun 3
Reach a score of 300 in Endless Mode
Reach a score of 200 in Endless Mode
Reach a score of 100 in Endless Mode
Complete Rainbow
Complete SuperHot
Complete Hoops
Complete Mirror
Complete Rings
Complete Predator
Complete Fog
Complete Duet
Complete Movement
Complete Blackout
Complete Speedrun 2
Complete Minefield
Complete Swipes
Complete Glitch
Complete Leaking
Complete Stage 6
Complete Inverse
Complete Stage 5
Complete Stage 4
Complete Stage 3
Complete Speedrun 1
Complete Flickers
Complete Stage 2
Complete Stage 1
Complete The Tutorial