Here is the full list of all 27 Squarism achievements.
Spend 5 wonderful minutes in credits menu
Finish 60 levels
Destroy your only movable shape
Sacrificed
Spend 20 minutes solving single level
Finish 50 levels
Opened
Finish 40 levels
Guided
Spend 3 minutes in level selection menu
Spend 5 minutes solving single level
Fail level 3 times
Use restart 10 times
Hivemind
Finish 30 levels
Breached
Finish 20 levels
Complete level after 5 restarts
Make wrong shape
Sticked
Complete level with that huge 4x4 square
Finish 10 levels
Use restart
Complete tutorial levels
Complete first level
Solve last level
Solve everything