Here is the full list of all 23 PolyCube achievements.
Clear 1 line
Clear 2 lines at once
Clear 3 lines at once
Clear 4 lines at once
Clear 5 lines at once
Reach Level 5
Reach Level 10
Reach Level 15
Reach Level 20
Score 50,000 points in a single game
Score 100,000 points in a single game
Score 250,000 points in a single game
Score 500,000 points in a single game
Score 1,000,000 points in a single game
Play 30 minutes in a single game
Play 1 hour in a single game
Make 5,000 PolyCube Movements
Make 5,000 PolyCube Rotations
Make 5,000 PolyCube Drops
Play 1:25 hours in a single game
Play 2 hours in a single game
Play 8 hours in a single game
Play a round in VR