Duke Nukem Forever

Cheat mode
Successfully complete the game on any difficulty to unlock the following cheats and bonuses at the "Extras" menu. Note: Enabling the "Infinite Ammo", "Instagib", or "Invincibility" cheat options will prevent Ego points and achievements from being earned.
Concept Arts
Development Timeline
Duke 3D Freeze Ray (freeze ray fires bouncing ice projectiles)
Duke Sound Board
Game Speed (adjust game speed)
Grayscale Mode (black and white graphics)
Head Scale (adjust head size of enemies and NPCs)
Infinite Ammo
Instagib (enemies killed with one shot and always gib)
Invincibility (no damage from bullets or explosions)
Mirror Mode (graphics are mirrored horizontally)
Movies
Screenshots
Triptych Office Photos
Microwaved rat
In Chapter 2: "Damn! It's Late...", there is a room with a microwave. Directly under the microwave is a cupboard that can be opened to find a rat. You can pick up the rat and put it in the microwave. Note: This room is also shared with the Duke Nukem Fanboy.
Easy "Air-Duke" achievement
In the "Duke Nukem's Titty City" chapter, go to the game room at the back of the club, and play a game of air hockey. Instead of focusing on scoring, try defending your goal as good as possible. The rest will happen by accident since the opponent is very weak.
Easy "Balls Of Steel" achievement
Pinball games are located in different locations throughout the game. The first pinball game can be found in "The Duke Cave" chapter. While playing the pinball game, to speed things up, you should get at least a x2 multiplier without wasting a ball. Hold the top left flipper, and bring the ball up there. Quickly release the flipper, and let it hit the three panels. If the ball is getting too far on the right side, you can tilt the table to the left by using the Left Analog-stick. Keep repeating this method. Do not use the tilt ability more than once every five seconds. If you use it too often, you will lose control over the flippers.

Easy "Bucket Head" achievement
The first helmet is at the very beginning of the "Vegas In Ruin" chapter in the back of a vehicle. The second helmet is at the beginning of "The Hive" chapter. Turn left after going through the first alien hole to find it. The third helmet is found in the "Blowin' The Dam" chapter. After planting the first bomb and fighting two octopuses, swim to some debris to your left to find it and get the "Bucket Head" achievement.

Easy "Call Waiting" achievement

Easy "Companion Barrel" achievement
In Part 2 of "The Forkstop" chapter, you will reach a large area where you need to turn the power on. After killing some waves of enemies, use the forklift, and climb the wall to your right. Grab the heart barrel, and go to the other side. Place the barrel on the blue heart drawing on the ground to open the secret room and get the "Companion Barrel" achievement.

Easy "I Am All That Is Man" achievement
There are 28 Ego Awards. There are a couple extra rewards that are gained automatically by playing through the story. If you get all Ego Awards during your first playthrough, you will get the "I Am All That Is Man" achievement in the "Blowin' The Dam" chapter.

Easy "I Need A Date" achievement
In "The Shrunk Machine" chapter, near the beginning, after entering the first large room, straight ahead across the room are some double doors. There is a calendar on the wall behind the double doors. Look at all pages to get the "I Need A Date" achievement. There is another calendar in Part 2 of "The Forkstop" chapter on the wall in one of the rooms.
Easy "Party Animal" achievement
In the "Duke Nukem's Titty City" chapter, drink all nine beers in the strip club to get the "Party Animal" achievement. One beer is behind the locked door. The code is "4768". Get all the other items that are required to proceed with the chapter. After giving the items to the stripper, you can enter the last room.



Easy "Pescaphobe" achievement
In the "Blowin' The Dam" chapter, kill all 15 catfish to get the "Pescaphobe" achievement. Turn on your Duke Vision to detect them much easier.

Easy "Sticky Bomb Like You!" achievement
At the beginning of "The Duke Dome" chapter, you will get an infinite amount of explosives when entering a building. Throw a trip mine directly on one of the enemies to get the "Sticky Bomb Like You!" achievement.
Easy "Sunday, Black Sunday" achievement
In the "Duke Lives" chapter, at the very beginning of your first fight, you will see a blimp in the background. Keep shooting it until you get the "Sunday, Black Sunday" achievement.
Easy "Turd Burglar" achievement
Poop can be found in toilets. There is some poop in the toilets in the room where the game begins ("Duke Lives" chapter). Grab poop from a toilet and throw it to get the "Turd Burglar" achievement.
Achievements
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
Extermination (25 points): Kill 50 aliens.
Annihilation (40 points): Kill 100 aliens.
Nuclear Devastation (50 points): Kill 250 aliens.
Hippy-Stomper (20 points): Foot stomp 12 aliens.
Judge, Jury, Executioner (20 points): Execute 20 aliens.
Trapper (20 points): Kill 10 aliens with Trip Mines.
Freeze Well! (20 points): Kill 15 frozen aliens.
Road Rage (20 points): Kill 15 aliens with the monster truck.
Fork the Pork (10 points): Kill 6 aliens with the forklift.
Dead Useful (15 points): Kill 10 aliens with environmental explosives.
Downtown Barrel Beatdown (15 points): Kill 10 aliens with tossed objects.
Duke Angry, Duke Smash! (20 points): Kill 15 aliens with melee attacks while on steroids.
Noms (10 points): Eat 10 pieces of food during the SP campaign.
On the Noggin (25 points): Kill 30 aliens with headshots.
Natural Disaster 3x (10 points): Kill 3 aliens at once.
FBT (10 points): Get knocked down 10 times.
Turd Burglar (10 points): Find and steal a piece of poo.
I Need a Towel (10 points): Get hit by 10 Pregnator bombs.
Baron von Nukem (20 points): Shoot down 20 alien fighters.
I Need a Date (5 points): Look at every page of a calendar in SP.
Sticky Bomb Like You! (10 points): Put a Trip Mine on a live alien.
Big Guns, Big Ships (10 points): Blow up 5 enemy gunships or dropships.
Air-Duke (30 points): Win air hockey with a score of 7-0 in the strip club.
Balls of Steel (25 points): Earn a 1,000,000 pinball score in SP.
Flagon of Chuckles (5 points): Drink a beer in SP.
Juiced (5 points): Take steroids in SP.
He's Got a Hologram! (5 points): Use a Holoduke in SP.
Drawrings (10 points): Doodle something on the whiteboard in SP.
Substance Abuser (10 points): Drink beer while on steroids or vice versa in SP.
I Am All That Is Man (40 points): Discover all Ego cap awards.
Gunslinger (50 points): Carry the gold pistol through the whole SP campaign.
Piece of Cake (20 points): Complete the SP campaign on Easy Difficulty.
Let's Rock (30 points): Complete the SP campaign on Normal Difficulty.
Come Get Some (40 points): Complete the SP campaign on Hard Difficulty.
Damn, I'm Good (50 points): Complete the SP campaign on Insane Difficulty.
Special Thanks (5 points): Watch the credits all the way through.
Bucket Head (30 points): Find all 3 helmets in the SP campaign.
Call Waiting (25 points): Listen to all phone messages.
Party Animal (10 points): Drink all of the beers in the strip club.
Pescaphobe (10 points): Kill all the catfish in the underwater level.
Sunday, Black Sunday (5 points): Shoot down the blimp above the stadium.
Nobody Likes a Whiner (5 points): Knock out the talent at the talk show.
Lots of Whacking (25 points): Win a game of Alien Abortion in the strip club.
Companion Barrel (10 points): Unlock the secret closet at the end of the Forkstop.
One-Eyed Freak (10 points): Defeat the Cycloid.
Pit Champion (25 points): Defeat the Battlelord in Las Vegas.
Not Bad for a Human (40 points): Defeat the Alien Queen.
A Good Dam Fight (25 points): Defeat the Battlelord on the Hoover Dam.
Octacide (25 points): Defeat the Octaking.
Beating the One-Eyed Worm (35 points): Defeat the Energy Leech.