Warhammer: Final Liberation

* While in the detachment selection screen:
Hold down the control key and type Paladin.
This ables you to use Knight Paladin units.

* During the battle:
Hold down the control key and type:
EYEOFTERROR : To be able to see all enemy units.
HERETIC : Completes the mission.
CLEANSINFIRE : Your hit probability is increased to 100%.
WHITEDWARF : Makes all your units invulnerable to ranged weapon fire, not close combat.

P.S: Control makes the selected unit fire so try to select a unit that has fired or it cannot fire.
(Information from Cheat Machine)