Duke Nukem 3D: 20th Anniversary World Tour

Since you can’t activate cheats while playing on the “Damn, I’m Good” difficulty, we’re going to trick the game. The easiest level to unlock this on is ‘Hollywood Holocaust’ in Episode 1 as it is the shortest. Plus, you can unlock “Alien Maggots are Gonna Pay” at the same time.

Start the level on the “Piece of Cake” difficulty. When you spawn on the rooftop, enter the cheat code and select ‘No Clip.’ Make sure that the message ‘Clipping: Off’ appears at the top of the screen. Now, no matter which level or which difficulty you play on until you quit the game from the Xbox Home screen, clipping will always be off, thus allowing you to walk through walls.

Press and select a new game. Choose ‘Hollywood Holocaust’ again but this time select the “Damn, I’m Good” difficulty. At the beginning of the level, destroy the fan and drop through the vent. Head left down the street (the cinema will be on the left and a flaming dumpster is on the right). When you get to the end of the street, turn left down the alley. Beware that there is are both Pigcops and Troopers here. Above you will be a walkway leading to a reddish area. Just walk into the wall below and you will magically jump up to the reddish area which is the end of the level. Be careful as there is another Pigcop waiting for you here. Once it is dead, press to break the glass and punch the Nuke Button and the achievement will unlock.