Duke Nukem Forever Cheats

Damn, I'm Good: Complete the SP campaign on Insane Difficulty
Dead Useful: Kill 10 aliens with environmental explosives
Drawrings: Doodle something on the whiteboard in SP
Duke Angry, Duke Smash!: Kill 15 aliens with melee attacks while on steroids
Extermination: Kill 50 aliens
Flagon of Chuckles: Drink a beer in SP
Fork the Pork: Kill 6 aliens with the forklift
Freeze Well!: Kill 15 frozen aliens
Full Body Tourettes: Get knocked down 10 times
Gunslinger: Carry the gold pistol through the whole SP campaign
He's Got a Hologram!: Use a Holoduke in SP
Hippy-Stomper: Foot stomp 12 aliens
I Am All That Is Man: Discover all ego cap rewards
I Need a Date: Look at every page of a calendar in SP
I Need a Towel: Get hit by 10 Pregnator bombs
Judge, Jury, Executioner: Execute 20 aliens
Juiced: Take steroids in SP
Let's Rock: Complete the SP campaign on Normal Difficulty
Lots of Whacking: Win a game of Alien Abortion in the strip club
Natural Disaster 3x: Kill 3 aliens at once
Nobody Likes a Whiner: Knock out the talent at the talk show
Noms: Eat 10 pieces of food during the SP campaign
Not Bad for a Human: Defeat the Alien Queen
Nuclear Devastation: Kill 250 aliens
Octacide: Defeat the Octaking
On the Noggin': Kill 30 aliens with headshots
One-Eyed Freak: Defeat the Cycloid
Party Animal: Drink all of the beers in the strip club
Pescaphobe: Kill all of the catfish in the underwater level
Piece of Cake: Complete the SP campaign on Easy Difficulty
Pit Champion: Defeat the Battlelord in Las Vegas
Road Rage: Kill 15 aliens with the monster truck
Special Thanks: Watch the credits all the way through
Sticky Bomb Like You!: Put a Trip Mine on a live alien
Substance Abuser: Drink beer while on steroids or vice-versa in SP
Sunday, Black Sunday: Shoot down the blimp above the stadium
Tosser... in the Literal Sense: Kill 10 aliens with tossed objects
Trapper: Kill 10 aliens with trip mines
Turd Burglar: Find and steal a piece of poo

The Doctor Who Cloned Me Steam Achievements
Another Piece of Cake: Beat the DLC campaign on Easy Difficulty
Bloody Red Rover: Kill 30 enemies with the moon rover
Bubble Buster: Kill 10 expanded enemies with melee attacks
Come Get a Little More: Beat the DLC campaign on Hard Difficulty
Damn, I'm REALLY Good: Beat the DLC campaign on Expert Difficulty
Heart to Heart: Finish Doctor Proton
Hedonist, not Misogynist: Discover and reject the video game that lets you slap women
I Am All That Is Man - Again!: Discover all Ego cap rewards in the DLC campaign
Let's Rock Out: Beat the DLC campaign on Normal Difficulty
Passive Aggressive: Let 20 enemies die by someone else's hand
Scientits: Earn a 1,000,000 pinball score on the Scientits pinball machine

Weapon clothing unlocks
These are clothing items unlocked through multi-player weapon-specific challenges to use in the changing room to customize your Duke for MP.

Backwards Baseball Cap: Get 250 kills with the Shotgun (Burger Face III)
Baseball Cap: Get 75 kills with pipe bombs (Splatter king III)
Brain Sucker: Get 250 kills with the Enforcer (Laser Seeking Missiles III)
Canadian Flag Logo: Get 75 kills with the Garter Pistol (Tiny But Deadly III)
Cheese Hat: Get 250 kills with the Ripper (Swiss Cheese III)
Detonator Logo: Get 250 kills with the Rocket Launcher (Boom Goes the Weasel III)
Hoplite Helmet: Get 75 melee kills (Punchy McPuncher III)
I Shot Stupid Logo: Get 250 kills with the Railgun (Right In the Eye III)
Jester Hat: Get 75 kills with trip mines (Watch your step III)
Military Hat: Get 250 kills with the Pistol (Size Doesn't Matter III)
Retro Duke Logo: Get 250 kills with the Devestator (Meat Grinder III)
Ski Goggles: Execute a frozen player 75 times (Ice to See You III)
Tie-Dye Shirt: Get 250 kills with the AT laser (Medium Rare III)
Uncle Sam Hat: Stomp on 75 enemies (Pee Wee Vermin III)
Wolf Logo: Get 75 kills with Steroids (Roid Rage III)
WTF Logo: Get 75 kills with exploding barrels (Smile You Son of a Bitch III)