Secret Weapons Over Normandy Cheats

It's simple really complete mission 12

Successfully complete all campaign and challenge missions to unlock the TIE Fighter in Instant Action mode.

For infinite ammunition, at the screen with the options of "New Game" and "Continue Game" press:

Up, Right, Left, Up, Right, Down, Left, L1, R1.
If done correctly, you should hear the prhase "Secret Code Accepted" spoken.

Punch in on title screen

Invulnerability:
U,D,L,R,L,L,R,R,L1,L1,R1,R1,L2,R2

Infinite ammo:
U,R,D,L,U,R,D,L,L1,R1

To unlock the X-wing and Tie Fighter in Instant Action Mode, beat all 15 missions and all 22 challenge missions.

To unlock the X-wing and Tie Fighter in Instant Action Mode, beat all 15 missions and all 22 challenge missions.