Completed "Dry Ice, Wet Graves"

Completed 20 ambush, outpost defense, or mortar secondary missions

Completed "Sanctuary of Sin"

Completed "Battle for Bladehenge"

Gained 5 or more seconds of hang time in a single jump - any mode

Completed "Exploited in the Bowels of Hell"

Visit the Insomniac Museum.

Complete the game on Casual.

Defeat Dr. Nefarious.

Rescue all Zoni.

Stop the Agorians from destroying Gimlick Valley.

Purchase all GrummelNet Weapons.