Cheat codes:
Unlock the listed cheat by pressing the corresponding sequence of buttons during game play.
Classic Wolverine Yellow/Blue Costume - A, X, B, X, A, Y, A, Y, A, X, B(2), X, click Right Analog-stick
Faster Enemy Reflex - A(2), X(2), Y(2), B(2), Y(2), X(2), A(2), click Right Analog-stick
Invincibility - X, A(2), X, Y(2), X, B(2), X, click Right Analog-stick
Infinite Rage - Y, X(2), Y, B(2), Y, A(2), Y, click Right Analog-stick
Immortality - square, X(2), square, triangle(2), square, circle(2), square, R3.
Secret costume:
After beating the game there will be another challenge in the bonus room that will unlock a costume.
Unlockable costumes:
Unlock the listed costume by completing the corresponding challenge.
Blue/Yellow Wolverine costume - Collect the two action figures of classic wolverine. Then, complete classic wolverine challenge.
Brown/Yellow Wolverine costume - Collect the two action figures of legendary wolverine. Then, complete legendary wolverine challenge.
X-Force costume - Collect the two action figures of x-force wolverine. Then, complete x-force wolverine challenge.
Unlock hard difficulty:
Beat the game.
Unlock 3D mode:
Beat the game on Hard difficulty.
Mysterious hatch location:
On the first level at the gatecrasher objective, crash the jeep through the gates killing all enemies. To the left of the gate there is a boarded up door. Cut the boards down, and enter it to find the mysterious hatch.
References easter eggs:
Portal reference - The Cake is a reference to Portal "The Cake is a lie"
Lost reference - The mysterious hatch is a reference to the hatch on lost at the end of the first series.
World Of Warcraft reference - The WoW! trophy is a reference to World Of Warcraft
Achievements:
Getting Started (10 points): Killed 100 enemies.
A Day's Work (20 points): Killed 500 enemies.
What I Do Best (30 points): Killed 2000 enemies.
You Can't Hide (20 points): Lunged to 250 enemies.
Lunge (10 points): Lunged to 25 enemies.
Pounce (15 points): Lunged to 100 enemies.
Piggy Back Ride (10 points): Lunged to a W.E.N.D.I.G.0 prototype's back.
Quick Killer (10 points): Quick Killed 1 enemy.
Efficient Killer (15 points): Quick Killed 20 enemies.
Perfect Killer (20 points): Quick Killed 3 enemies in a row.
Drop Dead (10 points): Killed 10 enemies by throwing them off high areas.
Apprentice (10 points): Raised One Combat Reflex to Master Level.
Samurai (25 points): Raised All Combat Reflexes to Master Level.
Mutant Lover (15 points): Raised one Mutagen to level 3.
Astonishing (20 points): Found 1/2 of all Dog Tags in the game.
Devil's Brigade (30 points): Found all Dog Tags in the game.
Defensive (10 points): Performed 1 Counter move.
Untouchable (20 points): Performed 25 Counter moves.
Catch! (10 points): Killed 1 enemy with a reflected projectile.
Boomerang (20 points): Killed 25 enemies with a reflected projectile.
Aerial Assault (10 points): Performed 10 Air Grabs.
Ultimate Wolverine (15 points): Fought 4 W.E.N.D.I.G.0 prototypes at the same time and defeated them at Alkali lake.
Hot Potato (20 points): Light 20 enemies on fire.
Shotgun Epic Fail (15 points): Killed 25 Ghosts with their own weapon.
James Howlett (15 points): Performed a Wolverine to Wolverine Lunge.
WoW! (15 points): You feel cold as you examine the skeleton and read the name "Arthas" etched into the nearby sword.
Aerial Master (15 points): Got 6 enemies airborne at once.
Fully Loaded (35 points): Maxed out all upgrades.
Slice n' Dice (15 points): Killed 6 enemies with a single attack.
Found! (15 points): You found a mysterious hatch.
Slaughter House (15 points): Dismembered 100 enemies.
Blender (25 points): Killed 200 enemies with Claw Spin.
Walking Death (50 points): Beat the game on Hard Difficulty.
Heightened Senses (20 points): Killed 200 enemies in Feral Sense.
Environmentally Friendly (15 points): Killed 10 enemies using objects in the environment.
Whatever it Takes (20 points): Killed 30 enemies using objects in the environment.
Bloodlust (20 points): Killed 50 enemies while in Berserker mode.
Weapon X (25 points): Killed 150 enemies while in Berserker mode.
The Cake (15 points): You found the cake, yummy.
Source: http://www.gamingcheats.com/xbox-360/11104/x-men-origins-wolverine-uncaged-edition-cheats.html
