Star Trek: Invasion

Cheat mode:
Press Up, Left, Down, Right, Up, Right, Down, Left, Up, L1 + R1, L2 + R2 at the mission selection screen to enable cheat mode and unlock all missions. The screen will flash to confirm correct code entry. Pause game play and select the "Cheat Screen" option to enable "All Weapons", "One Hit Kills", and "Player Can't Die".
Information in this section was contributed by Abraham Scalapino, James Rodier, and pdams.

View credits:
Press [Left, Right, Up, Down] five times at the mission briefing screen.
Information in this section was contributed by Abraham Scalapino.

Secret mission 1A:
Successfully complete mission 1 under five minutes with more than 40% accuracy.
Information in this section was contributed by oiyoig.

Secret mission 1B:
Successfully complete mission 1 under six minutes with more than 60% accuracy.
Information in this section was contributed by jola35.

Secret mission 4A:
Successfully complete mission 4 under 6 minutes 44 seconds with more than 40% accuracy.
Information in this section was contributed by oiyoig.

Secret mission 5A:
Destroy at more than half of the Energy Plough and use your tractor beam on the second half in mission 5.
Information in this section was contributed by oiyoig.

Secret mission 5B:
Search for the Info unit in mission 5 and use the tractor beam to acquire it.
Information in this section was contributed by oiyoig.

Hint: Fire secondary weapon farther and faster:
Fire a secondary weapon while dropping out of warp speed with a target already locked. Although this trick works with most secondary weapons, it works best with Photon or Quantum Torpedoes.
Information in this section was contributed by Nate Harter.