Press [Ctrl] + [Alt] + [~] on your keyboard, and enter - cheat 1
Type any of the following cheat codes:
cmd godmode - God mode
cmd noclip - Turns clipping off
cmd giveall - Gives all
unlock all - Unlocks everything
cmd selfsummon - spawns a riddick clone
cmd kill - commits suicide
cyclecamera - switches between 1st person and 3rd person
When using the giveall command, make sure to use it repeatedly
to unlock newer items pertaining to the area of the game you 're in.
There is a glitch with the give all. At a certain point in the game,
you are supposed to talk to a prisoner, to obtain a code for an
elevator/door area. Using giveall gives you the code, and if you
use the code on the elevator before talking to him you wont be
able to progress very far because you can't engage a conversation
with him. So forewarning.. be very careful with the give all cheat.
Although having items wont affect progression of existing quests,
you may or may not be able to access new ones.