Piece of Cake
Complete "L.A. Meltdown" on any difficulty.
Let's Rock
Complete "Lunar Apocalypse" on any difficulty.
Come Get Some
Complete "Shrapnel City" on any difficulty.
Damn, I'm Good
Complete "The Birth" on any difficulty.
I'm Back, Baby
Complete "Alien World Order" on any difficulty.
Duke's Mighty Foot
Step on 40 enemies after using the Shrinker on them.
It Happens
Step in a pile of excrement.
Shake It, Baby
Tip an exotic dancer.
Oomph, Uugh, Where Is It?
Find 70 secret areas.
Alien Maggots are Gonna Pay
Finish the "Hollywood Holocaust" level in under 3 minutes.
Invaders Must Die!
Kill 1000 enemies.
Take No Prisoners
Kill every enemy on a level.
Cheating!
Use a cheat code.
Doomed Marine
Find the Doomguy in the Level "Death Row".
Duke, Use the Force!
Find Luke in the Level "Lunar Reactor".
All Too Easy
Find a secret area.
Why So Serious!?!
Find Sam in "Mirage Barrage".
I Never Inhaled
Use the hookah in High Times.
See, I'm Tough Too!
Finish any level on "Damn, I'm Good" difficulty.
I Never Knew This Was Here
Find any secret level.
That's What She Said
Listen to Developer Commentary (Use at least one trigger).
Smoke 'Em If You Got 'Em
Use the Incinerator
Roast 'Em
Burn 50 bad guys to death.
Buzz Off
Kill a Firefly Trooper while it's flying small.
More Than 2 Weapons At Once?
Carry all weapons with ammo at once.
Nukem All
Kill 5 bad guys with one shot.
Rage Engage
Kill 10 bad guys in 10 seconds while on steroids.