At any menu, type iamcheater or iwillcheat. You may
need to enter it twice. You'll hear a sound to confirm.
Now enter the following at any menu or during play: 

allloot         All weapons, ammo and items
debugdrawwire   Wire frame mode
cantdie         God mode
enemyf          Front view of enemy
enemyb          Back view of enemy
funnyhead       Big head mode
gamedone        Win current mission
gamefail        Lose current mission
goodhealth      Full health
killthemall     Kill all enemies
laracroft       Different uniforms
openalldoor     Opens all doors
playercoords    Show coordinates in top left corner 
resurrect       Come back as a zombie after dying
showtheend      See ending sequence
nohits          Take no damage
bluestars       Restore censored version to full


by unknown