Advanced Freefall ship:
Achieve the bonus objective in Act 3 Mission 1.
Advanced Havoc ship:
Achieve the bonus objective in Act 3 Mission 3.
Advanced Jedi Starfighter:
Achieve the bonus objective in Act 2 Mission 4.
Advanced Zoomer ship:
Achieve the bonus objective in Act 2 Mission 3.
Alternate views:
Under the options menu, enter DARON to unlock everything.
Bizarre Controls:
Enter JARJAR on the code screen.
Full Screen Cockpit:
Enter CONVISTA on the code screen.
Hidden Snowman:
In the Mount Merakan mission near one of the ore refineries there are some little huts. If you destroy all of them and look under them one of them has a droid making a snowman.
Invincibility:
Under the options menu, enter SOLID to unlock eveything.
Invincible Craft:
Enter ARTOO on the code screen.
Republic Gunship:
Achieve the bonus objective in Act 3 Mission 5.
Sabaoth Fighter:
Achieve the bonus objective in Act 2 Mission 5.
Slave 1 ship:
Achieve the hidden objective in all missions.
TIE Fighter:
Achieve the bonus objective in Act 1 Mission 4.
Unlock Everything:
Under the options menu, enter LONGO to unlock eveything.
Unlock Z-95 Headhunter:
Enter, “Hunter” at the passcodes screen.
X-Wing:
Achieve the bonus objective in Act 1 Mission 3.