Xbox Cheats-

Raise Wanted Level RB, RB, B, RT, LEFT, RIGHT, LEFT, RIGHT, LEFT, RIGHT
Lower Wanted Level RB, RB, B, RT, RIGHT, LEFT, RIGHT, LEFT, RIGHT, LEFT
Fast Run Y, LEFT, RIGHT, RIGHT, LT, LB, X
Give Parachute LEFT, RIGHT, LB, LT, RB, RT, RT, LEFT, LEFT, RIGHT, LB
Explosive Melee Attacks RIGHT, LEFT, A, Y, RB, B, B, B, LT
Bang Bang (Explosive Bullets) RIGHT, X, A, LEFT, RB, RT, LEFT, RIGHT, RIGHT, LB, LB, L1
Flaming Bullets LB, RB, X, RB, LEFT, RT, RB, LEFT, X, RIGHT, LB, LB
Slow Motion Aim X, L2, RB, Y, LEFT, X, L2, RIGHT, A
Drunk Mode Y, RIGHT, RIGHT, LEFT, RIGHT, X, B, LEFT
Change Weather RT, A, LB, LB, LT, LT, LT, X
Slidey Cars Y, RB, RB, LEFT, RB, LB, RT, LB
Slow Motion Y, LEFT, RIGHT, RIGHT, X, RT, RB
Spawn Buzzard Attack Helicopter B, B, LB, B, B, B, LB, LT, RB, Y, B, Y
Spawn Comet RB, B, RT, RIGHT, LB, LT, A, A, X, RB
Spawn Sanchez B, A, LB, B, B, LB, B, RB, RT, LT, LB, LB
Spawn Trashmaster B, RB, B, RB, LEFT, LEFT, RB, LB, B, RIGHT
Spawn Limo RT, RIGHT, LT, LEFT, LEFT, RB, LB, B, RIGHT
Spawn Stunt Plane B, RIGHT, LB, LT, LEFT, RB, LB, LB, LEFT, LEFT, A, Y
Spawn Caddy B, LB, LEFT, RB, LT, A, RB, LB, B, A
Spawn Rapid GT RT, LB, B, RIGHT, LB, RB, RIGHT, LEFT, B, RT
Spawn Duster RIGHT, LEFT, RB, RB, RB, LEFT, Y, Y, A, B, LB, LB

PS3 Cheats-

Raise Wanted Level R1, R1, CIRCLE, R2, LEFT, RIGHT, LEFT, RIGHT, LEFT, RIGHT
Lower Wanted Level R1, R1, CIRCLE, R2, RIGHT, LEFT, RIGHT, LEFT, RIGHT, LEFT
Fast Run TRIANGLE, LEFT, RIGHT, RIGHT, L2, L1, SQUARE
Give Parachute LEFT, RIGHT, L1, L2, R1, R2, R2, LEFT, LEFT, RIGHT, L1
Explosive Melee Attacks RIGHT, LEFT, X, TRIANGLE, R1, CIRCLE, CIRCLE, CIRCLE, L2
Bang Bang (Explosive Bullets) RIGHT, SQUARE, X, LEFT, R1, R2, LEFT, RIGHT, RIGHT, L1, L1, L1
Flaming Bullets L1, R1, SQUARE, R1, LEFT, R2, R1, LEFT, SQUARE, RIGHT, L1, L1
Slow Motion Aim SQUARE, L2, R1, TRIANGLE, LEFT, SQUARE, L2, RIGHT, X
Drunk Mode TRIANGLE, RIGHT, RIGHT, LEFT, RIGHT, SQUARE, CIRCLE, LEFT
Change Weather R2, X, L1, L1, L2, L2, L2, SQUARE
Slidey Cars TRIANGLE, R1, R1, LEFT, R1, L1, R2, L1
Slow Motion TRIANGLE, LEFT, RIGHT, RIGHT, SQUARE, R2, R1
Spawn Buzzard Attack Helicopter CIRCLE,CIRCLE, L1, CIRCLE,CIRCLE, CIRCLE, L1, L2, R1, TRIANGLE, CIRCLE, TRIANGLE
Spawn Comet R1, CIRCLE, R2, RIGHT, L1, L2, X, X, SQUARE, R1
Spawn Sanchez CIRCLE, X, L1, CIRCLE, CIRCLE, L1, CIRCLE, R1, R2, L2, L1, L1
Spawn Trashmaster CIRCLE, R1, CIRCLE, R1, LEFT, LEFT, R1, L1, CIRCLE, RIGHT
Spawn Limo R2, RIGHT, L2, LEFT, LEFT, R1, L1, CIRCLE, RIGHT
Spawn Stunt Plane CIRCLE, RIGHT, L1, L2, LEFT, R1, L1, L1, LEFT, LEFT, X, TRIANGLE
Spawn Caddy CIRCLE, L1, LEFT, R1, L2, X, R1, L1, CIRCLE, X
Spawn Rapid GT R2, L1, CIRCLE, RIGHT, L1, R1, RIGHT, LEFT, CIRCLE, R2
Spawn Duster RIGHT, LEFT, R1, R1, R1, LEFT, TRIANGLE, TRIANGLE, X, CIRCLE, L1, L1

Entering any of the above codes will disable achievements/trophies until the system is rebooted. They can be entered during normal gameplay and a confirmation will show up above the map.