Infinite Feral Attacks
Enter "Bloodlust" as a case-sensitive code.

Infinite ammunition
Enter "UnleashHell" as a case-sensitive code.

Restore health
Enter "ImJackCarver" as a case-sensitive code.

Feral Attack in the early levels
Enter "FeralAttack" as a case-sensitive code.

All maps
Enter "GiveMeTheMaps" as a case-sensitive code to unlock all maps. Note: This code cannot be disabled unless your profile is deleted.

Evolution Story mode
Enter "GiveMeItAll" as a case-sensitive code to unlock Evolution Story mode. Alternately, successfully complete Instincts Story mode to unlock Evolution Story mode.

Hidden message
At the map editor screen, press LT + RT + LB + RB + X + Y + B + A + click and hold Left Analog-stick + Right Analog-stick to display the French text "J'avions vu une plane!".

No reloading
Get two Desert Eagles. Shoot one gun, then just as you reload, shoot the other. One of the guns will constantly reload, and you can keep shooting the other one. Note: You will not have infinite ammunition.

Game references
In some levels, you can find a magazine named "Gamer Lamer". The magazine's cover has a mock-up picture of Gordan Freeman from Half-Life. The cover of the magazine reads "Quarter-Life 2 Amazing New Screenshots! Medal Of Shame, and Broom 3". These are mockups of Half-Life, Medal Of Honor, and Doom 3.

Achievements
Accomplish the indicated achievement to get the corresponding number of Gamerscore points (1,000 total possible points):

Instincts Rookie (10 points): complete the Instincts story on the Rookie difficulty.
Instincts Hunter (15 points): complete the Expansion story on Hunter difficulty.
Instincts Predator (30 points): complete the Instincts story on Predator difficulty.
Stalker (30 points): Get 50 Trap kills in any Solo mode.
Head Collector (30 points): Get 100 headshots in any Solo mode.
Shadow Hunter (30 points): Get 40 Stealth kills in any Solo mode.
Feral Warrior (30 points): Get 80 Feral Punch kills in any Solo mode.
Instincts Devourer (40 points): complete the Instincts story on all difficulty.
Treasure Raider (100 points): Find all of Doctor Krieger's lost research.
Chaos Winner (5 points): complete an online game in Chaos mode in first position.
Team Chaos Winner (5 points): complete game in 1st place in online Team Chaos.
Predator Winner (5 points): complete Multiplayer game in Predator mode in first.
Seek n' Secure Winner (5 points): complete in first place in online Seek n' Secure
Multiplayer Master (30 points): first place at least once in all online game modes.
Chaos Champion (20 points): Get ranked first 50 times in Multiplayer Chaos mode.
Road Demon (30 points): Get 100 kills by road kills in any Multiplayer game mode.
Multi Stalker (30 points): Get 100 traps kills in any Multiplayer game mode.

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