At the bridge screen, press L1, Circle, L1, R1, Triangle(2), Circle, Select.
One Hit One Kill
Enter the code "destroyer" at the code menu. This
will destroy enemy targets.
All Medals And Ranks
At the main menu (the Bridge), press L1, R1, L1,
O, R1, Triangle, L1, Select
At the main menu (the Bridge), Press R1, L1, O,
Square, L1, R1, Triangle, Select.
At the bridge screen press L1, Square, L1, R1, Triangle, Select for all Levels.
If you enter the code correctly, you will hear a beep.
Unlock All Ships
Go to the menu screen and press L1, Square, L1, Square, R1(2), Circle, Select.