Tier 1 weapons :
Press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down, Right, Up. This will unlock the weak weapons.

Tier 2 weapons:
Press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down, Down, Left. This will unlock the medium weapons.

Tier 3 weapons:
Press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down, Down, Down. This will unlock the powerful weapons.

Respect upgrade:
Press R1, R2, L1, X, Left, Down, Right, Up.

Bounty on your head:
Press Down, Up, Up, Up, X, R2, R1, L2, L2.

Armor, health, money, and street creds:
Press R1, R2, L1, X, Left, Down, Right, Up, Left, Down, Right, Up.

$250,000:
Press R1, R2, L1, X, Left, Down, Right, Up, Left, Down, Right, Up.

Raise wanted level:
Press R1, R1, Circle, R2, Left, Right, Left, Right, Left, Right.

Lower wanted level:
Press R1, R1, Circle, R2, Up, Down, Up, Down, Up, Down.

Perfect handling:
Press Triangle, R1, R1, Left, R1, L1, R2, L1. Press L3 to jump in a car.

Aggressive traffic:
Press R2, Circle, R1, L2, Left, R1, L1, R2, L2.