Here is the full list of all 22 Dancing Cube achievements.
Complete a level
Complete a level without getting hit
Complete a level without getting hit in a lobby of four players
Use a power
Make someone take damage with a shockwave
Steal a power
Steal someone's shockwave and make him take damage with it
Reach a speed multiplier of two in the infinity mode
Use 10 powers
Use 100 powers
Steal 10 powers
Steal 100 powers
Stay still during 30 seconds without taking any damage
Complete a level without jumping
Complete a level without jumping or getting hit
Complete all levels
Complete all levels without getting hit
Win a multiplayer game with no more than 100 points difference with the second player
Win a multiplayer game without powers
Stay still during an entire level in a lobby of four players
Complete a level without getting hit as two players
Complete a level without getting hit as four players