Pop 20 Grunt eyeballs.

Defeat Douglas.

Kill every enemy on a level.

Obtain Knifey.

Kill Slumsley.

Finish the "Hollywood Holocaust" level in under 3 minutes.

Complete "Lunar Apocalypse" on any difficulty.

Kill 10 bad guys in 10 seconds while on steroids.

Step on 40 enemies after using the Shrinker on them.

Defeat Guardian of N'Erud

Finish Frozen Junkyard without hitting any hazards or respawning.

Cause an opponent to spin-out using a Red Burst.