Kill an enemy with infighting
Bomb enemy kills multiple enemies
Play the game at 1:11am
Push enemy into projectile when time is stopped
Use spikes to kill five enemies in one stage.
Hit two enemies with your laser twice in a row
Phase 20 times in 1 minute
Beat game without taking damage
Bump 1000 walls
Find all secrets in the game
Rescue all 111 scientists
Spend half-an-hour in time-stop