Unlock Empire Strikes Back Arcade game:
Beat all standard missions in the single player game.

Unlock Slave 1:
Beat all standard missions in the single player game with all bronze medals.

Unlock Millenium Falcon:
Beat all missions - including bonus missions - in the single player game with all bronze medals.

Unlock Jedi Starfighter:
Beat the single player game with all silver medals.

Unlock TIE Hunter:
Beat the single player game with all gold medals.

Unlock Naboo Starfighter:
Beat the training mission in all four times of the day (morning, day, afternoon, and night). You must complete all of the objectives, and find all the secret objects. It's very similar as to how you could unlock the Naboo Starfighter in Rogue Leader.

Ace mode:
Beat all missions - including bonus missions - in the single player game with all gold medals.

Unlock Endurance Level:
At the Mission select screen, buy Executor bonus level. Beat it, and you can buy the Endurance level for 30 points.

Advanced Shields:
Found in the fourth transport on the 'Revenge of the Empire' level. Do not destroy the transport until you fly through it to get the upgrade.

Advanced Lasers:
Found in the speeder section of 'Defiance on Dantooine' level. Right after the second boost jump, there will be some APCs. Go to the left of these along a narrow ledge and you will get the upgrade.

Advanced Targeting Computer:
Found in the 'Defenders of Ralltiir' level. There are 3 bridges, one where you start, one straight across from you, and one to the left. Go to the one to the left and destroy the Imperial Transport there to receive this upgrade.

Advanced Proton Torpedos:
Found in the 'Geonosis' level. When on foot, look in the back of one of the escape pods. It is hidden by smoke.

Homing Proton Torpedos:
Found in the 'Extraction from Ralltiir' level. At beginning go left, then right and hug the right wall.

Advanced Proton Bombs:
Found in the 'Raid at Bakura' level. Get to the TIE bomber, bomb the last building and it's inside.

Spread Proton Bombs:
Found in the 'Deception at Destrillion' level. It's on the second section inside the Laser bowl.

Advanced Cluster Missiles:
Found in the 'Battlefield Hoth' level. On the second section, use the e-web cannon to destroy the right box that the AT-ST comes out of, run over to grab the power up.

Homing Cluster Missiles:
Found in the 'Triumph of the Rebellion' level. Go forward to the catapults, then turn to the right and search the area.

Advanced Concussion Missiles:
Found in the 'Guns of Dubrillion' level. At beginning go up the ramp and look down one of the paths to the left.

Homing Concussion Missiles:
Found in 'Speeder Bike Pursuit' level. Toward the end of the level, there will be a small path to the left. Take it to get the power up.

Thanks to Revolution readers Justin Krebs, Aaron, Npard, Jarod Siefker and Marty Barnett!