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XBox - Star Wars: Republic Commando cheats

God mode:
Pause the game play, then push Y, Y, L, Up, X, Black, X, Y buttons on 
your controller. The sound of an explosion will confirm the correct 
code input.

Maximum ammunition:
Pause the game play, then push Y, Y, X, Down, R trigger, L trigger, 
R trigger, Up buttons on your controller. The sound of an explosion 
will confirm the correct code input. Reload the current weapons 
with maximum ammunition.

Unlock Temuera Morrison interview
Finish the Kashyyyk campaign.

Unlock Foley featurette
Finish the Geonosis campaign

Unlock Spec Ops featurette
Finish the Assault Ship campaign

Kill Droidekas
Stand as close as you can to it and kill it with melee attacks.

Walking turrets
Go into a gun turret, while playing in the Wookie level hanger.
Move the turret around the hanger by using the Left thumb-stick

Electronic Disruption
Use a concussion rifle on hand, use its melee strike to stop 
and drop a droid in hand-to-hand combat.