Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Alien Maggots are Gonna Pay	Finish the "Hollywood Holocaust" level in under 3 minutes.	40
All Too Easy	Find a secret area.	15
Buzz Off	Kill a Firefly Trooper while it's flying small.	15
Cheating!	Use a cheat code.	15
Come Get Some	Complete "Shrapnel City" on any difficulty.	80
Damn, I'm Good	Complete "The Birth" on any difficulty.	80
Doomed Marine (secret)	Find the Doomguy in the Level "Death Row"	15
Duke's Mighty Foot	Step on 40 enemies after using the Shrinker on them.	40
Duke, Use the Force! (secret)	Find Luke in the Level "Lunar Reactor"	15
I Never Inhaled	Use the hookah in High Times.	15
I Never Knew This Was Here	Finish a secret level.	15
I'm Back, Baby	Complete "Alien World Order" on any difficulty.	80
Invaders Must Die!	Kill 1000 enemies.	40
It Happens	Step in a pile of excrement.	15
Let's Rock	Complete "Lunar Apocalypse" on any difficulty.	80
More Than 2 Weapons At Once?	Carry all weapons with ammo at once.	40
Nukem All	Kill 5 bad guys with one shot.	40
Oomph, Uugh, Where Is It?	Find 70 secret areas.	40
Piece of Cake	Complete "L.A. Meltdown" on any difficulty.	80
Rage Engage	Kill 10 bad guys in 10 seconds while on steroids.	40
Roast 'Em	Burn 50 bad guys to death.	40
See, I'm Tough Too!	Finish any level on "Damn, I'm Good" difficulty.	60
Shake It, Baby	Tip an exotic dancer.	15
Smoke 'Em If You Got 'Em	Use the Incinerator	15
Take No Prisoners	Kill every enemy on a level.	40
That's What She Said	Listen to Developer Commentary (Use at least one trigger).	15
Why So Serious!?! (secret)	Find Sam in "Mirage Barrage".	15