Activate the following cheats by entering the corresponding codes at "Main Menu" > "Extras" > "Unleashed Codes":

CHEAT FUNCTION - CHEAT CODE
Invincibility - "QSSPVENXO"
Infinite Force - "TVENCVMJZ"
Maximum Force powers - "CPLOOLKBF"
Amplified lightsaber damage - "LIGHTSABER" or "MOMIROXIW"
Jedi Adventure robe - "HOLOCRON" or "ZWSFVENXA"
Jedi Ceremonial robe - "CURSEZRUX"
Kento's robe - "WOOKIEE" or "EEDOPVENG"
Sith Stalker armor - "CPLZKMZTD"
Play as Darth Vader - "HRMXRKVEN"
Play as General Rahm Kota - "MANDALORE" or "EEDOPVENG"

Complete the game to unlock Darth Vader in Multiplayer mode.

Complete the game after choosing to battle The Emperor at the end to unlock the Jedi Ceremonial robe.

Complete the game after choosing to battle Darth Vader at the end to unlock the Sith Stalker armor.