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