Invincibility:

Enter the password 1WITHFORCE

Unlimited secondary and special weapon:

Enter the password CHOSEN1

Unlock all Campaign missions:

Enter the password GASMASK

Unlock All FMV:

Enter the password CINEMA

Completed bonus objectives for prior mission:

Enter the password YUB_YUB

Multiplayer level select:

Enter the password FRAGFIESTA

Battle Droid unlocked in Geonosis level:

Enter the password ROGERROGER

Wookiee unlocked in Geonosis level:

Enter the password FUZZBALL

Clone trooper unlocked in Geonosis level:

Enter the password FAKE FETT

Amidala unlocked in Geonosis level:

Enter the passcode CORDE

Super Battle Droid unlocked in Geonosis level:

Enter the password WAT TAMBOR

Programming team photographs:

Enter the password SAYCHEESE. This only works if you're already unlocked the Sketchbook.

Yub Yub Ewok Song:

At the options screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start.