All cheats available:
     To  get  all  the  cheats  you pause the game and then hold the L
trigger Down and press X, Up, Down, X, A, B, Right, Left, Down

A nice strategy:
     A nice strategy, when you are protecting something is to use your
after  burners.  To do this hold the right trigger down then press the
top button near the trigger. Afterburners are very useful. Fx. mission
eight  is  to protect the Reliant, because it need repairs and you are
to  guard  it.  This  mission  is very difficult without after burners
because  there  are  three  torpedo  bombers  that come from different
directions. You'll need to take them out the torpedoes before they get
to  the  Reliant. Afterburners are also useful if you need to catch up
to something or run away.