Wreckless [Xbox]

Gold rank on all missions:
Highlight the "Unlimited time" option at the main menu then press L + R + Right + Z as the game loads.

Missions A-2 to A-4:
Successfully complete mission A-1.

Missions B-2 to B-4:
Successfully complete mission B-1.

AUV:
Successfully complete mission A-9.

Dragon-SPL Car:
Successfully complete mission A-1.

Super Car:
Successfully complete mission B-1.

Tank-90:
Successfully complete mission B-8.

Press Y to fire missiles that will destroy anything except buildings.

Tiger-SPL:
Successfully complete mission A-8 to unlock the car that Tiger Tagachi drives.

Yakuza Car:
Successfully complete mission B-9.

Music test:
Successfully complete all twenty missions to unlock the "Music Test" selection at the options screen.

Alternate view:
Press Down to cycle through different screen effects during game play and replays. To unlock more effects, successfully complete missions A-9, A-10, B-9, and B-10.

Use any car on any mission:
After unlocking all the cars you can cycle through them from both scenarios on any mission. Just scroll past one set to get to the second. Be careful, as in some missions the car you choose affects the opponent you will face.

Better acceleration:
Press R + A.

Perfect hand brake:
Press A + B.