Step in a pile of excrement.
Tip an exotic dancer.
Find a secret area.
Finish the "Hollywood Holocaust" level in under 3 minutes.
Listen to Developer Commentary (Use at least one trigger).
Complete "Alien World Order" on any difficulty.
Complete "The Birth" on any difficulty.
Complete "Shrapnel City" on any difficulty.
Kill every enemy on a level.
Complete "Lunar Apocalypse" on any difficulty.
Complete "L.A. Meltdown" on any difficulty.
Carry all weapons with ammo at once.
Use a cheat code.
Completed all trophies for the game!
Step on 40 enemies after using the Shrinker on them.
Find 70 secret areas.
Kill 1000 enemies.
Find the Doomguy in the Level "Death Row".
Find Luke in the Level "Lunar Reactor".
Find Sam in "Mirage Barrage".
Use the hookah in "High Times".
Finish any level on "Damn, I'm Good" difficulty.
Finish a secret level.
Use the Incinerator.
Burn 50 bad guys to death.
Kill a Firefly Trooper while it's flying small.
Kill 5 bad guys with one shot.
Kill 10 bad guys in 10 seconds while on steroids.