During the game press [~] to bring down the console then type the command. Each command is a toggle, 1 to turn it on, 0 to turn it off.
|god 1||God Mode|
|fullstamina 1||Unlimited Stamina|
|drawkilledcount 1||Show # of Kills|
|drawpaths 1||Draw Engine Paths|
|drawpostacpaths 1||Draw Other Paths|