Complete level 50.
Die by fire on any level.
Complete level 25.
Get a key on any level.
Complete level 15.
Invert gravity on any level.
Use a teleport on any level.
Dematerialize any box.
Destroy a bridge on any level.
Die by exiting the level boundaries at any point in the game.
Explode a TNT box.
Get 3 stars on any level.
Hit a scary pumpkin.