Complete the following achievements to unlock Xbox Live Gamerscore points.
| Achievement | How to unlock |
| A Real Challenge (20 points) | Acquire at least one star in each of the Challenge Rooms 1 to 56.
| | Cat burglar (20 points) | Get to the boss of Area 05 within one minute and thirty seconds.
| | Clean as a whistle (20 points) | Clear Area 02 without touching a slime blob.
| | Elite Commando (5 points) | Clear the game on Super Hard.
| | Faster Than a Speeding Bullet (20 points) | Block 100 projectiles using the claw.
| | Frank is that YOU? (11 points) | Defeat a Franken without taking any damage.
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| Arron Sedillo Challenge Room |
| Press Right, Down, Left, Up, LB, RB, Y(2), A(2), Start at the "Press Start" screen to unlock a fan made challenge room at the "Challenge Room" menu. |
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| Fake Pause / Invincibility |
| At any point in the game, press the Guide button and immediately press Back. You must press guide a fraction of a second BEFORE you press back. The guide will come up like normal so leave the guide and go back to the game. You'll notice that the game is paused yet everything is still moving! Enemies will still fire at you and everything will move except you. You can't move of course but an interesting property is that you cannot take damage or be affected by ANYTHING. That's right! You are invincible while it's paused! Use this trick on the Fabricator for an easy win! You can also start a swing and do the glitch to fly through electrical gates or other obstacles without taking damage! |
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| GamesRadar Challenge Room |
| Press RB, Y, X(2), Up, Down, LB(2), Up, Down, Start at the "Press Start" screen to unlock the GamesRadar challenge room at the "Challenge Room" menu. |
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| Major Nelson Challenge Room |
| Press LB, X(3), Right, Down, LB, Left, Y, Down, Start at the "Press Start" screen to unlock the Major Nelson challenge room at the "Challenge Room" menu. |
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| Retro Costume |
| Press Up, Left, A, Y, Up, Down, Left, Right, X, B, A, Down, B, Y, Start during game play. |
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| Secret Challenge Rooms |
At the menu screen where it says "Press Start," enter these codes, quickly.
| Code | Effect |
| Up, Down, Y, X, X, Y, Down, Up, LB, LB, Start | Unlocks IGN Challenge Room for Xbox 360 (also works on PC version with 360 controller input)
| | Down, Up, Down, Up, Left, LB, X, LB, X, Y, Start | Unlocks Eurogamer Challenge Room for Xbox 360 (also works on PC version with 360 controller input)
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| Unlock Super Hard Difficulty |
| Beat the game on any difficulty. |
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