Get Dark Campaign:
First start a new game then put in your save game name. When the Episode Selection screen begins press X, Y, Y, X, X, Y, X, Y
God Mode:
Pause game play, then press X, Y, X, X, Y, Y, X, Y, X, X, Y, Y to unlock “God Mode” and “Complete Mission” options at the pause menu.
Get Earth Golem:
Finish the Light Campaign to unlock the Golem
Stone Gnome:
You unlock the Stone Gnome once you beat the dark campaign.
Unlock Fetica:
Get ALL of the gold in the Dark Campaign
Unlock 9320 Battle Droid:
Get ALL of the gold in the Light Campaign
Hint:
Enemies in the light campaign die after five to ten seconds or more if they are standing in water on the beach. If you can lure enemies into the water you can kill them without getting hurt. Works on goblins may work on large enemies.