Completed "In One Way..." in less than 16 seconds.
Completed "Spike Dodging" without using the teleporter.
Completed "Extending Platform" without using the rope.
Defeated the guardian of the clocktower.
Completed all of the dungeon levels.
Completed all of the boiler room levels.
Completed all of the gallery levels.
Completed all of the graveyard levels.
Completed all of the clocktower levels.
Completed a level containing Shmu.
Completed a time travel level.
Completed all the CoOp levels.