Need for Speed Undercover Cheats

Achievements

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Community Member (15 points): Create or use an existing account to sign into EA Nation.
Active Community Member (20 points): Participated in any Community Day. Visit NeedforSpeed.com for more info.
Freeze! Hold it right there! (25 points): Take a Photo and upload it to NeedforSpeed.com.
Learner's Permit (5 points): Acquire your first car in Career Mode.
Apprentice Mechanic (5 points): Customize a car in Career mode.
Meet Zack (10 points): Face off against Zack in 'Rush Hour'.
Meet Carmen (10 points): Face off against Carmen in 'The Game'.
Meet Hector (10 points): Face off against Hector in 'Versus'.
Meet Nickel (10 points): Face off against Nickel in 'Road Rage'.
Meet Rose (10 points): Face off against Rose in 'Rollercoaster'.
Zack Trap (25 points): Complete the Zack sequence in 'The Trap' mission.
Bowling with Hector (25 points): Complete the Hector sequence in the mission 'Kingpin'.
To Protect and Serve (25 points): Complete the Carmen sequence in the mission 'Rematch'.
Nickel and Dimes (25 points): Complete the Nickel sequence in mission 'Payback'.
2 Birds, 1 Stone (25 points): Complete the mission 'Double Trouble'.
Gold Coast to Ocean (15 points): Dominate the Gold Coast to Ocean event.
East Fasulo Bridge (15 points): Dominate the East Fasulo Bridge event.
Pine Creek & Douglas (15 points): Dominate the Pine Creek & Douglas event.
South Canyon Hwy (15 points): Dominate the South Canyon Hwy event.
East I-5 (15 points): Dominate the East I-5 event.
Bay Drive & Harbor (15 points): Dominate the Bay Drive & Harbor event.
Tri-City Run (15 points): Dominate the Tri-City Run event.
North River Expressway (15 points): Dominate the North River Expressway event.
Lose the Eye in the Sky (25 points): Escape from a helicopter in a successfully completed pursuit. (Must be Career level 8 or greater).
Path of Destruction (10 points): Disable 10 Police Cars in a Pursuit and successfully evade in Career.
Get out of the way! (5 points): Avoid 5 Road Blocks in a Pursuit and successfully evade in Career.
Aficionado (10 points): Purchase or win any 5 cars for your garage.
Keys to the City (5 points): Unlock Port Crescent in Career.
Branching out (10 points):... 

Once you unlock this you can use this car to catch criminals for extra money, but you cannot participate in races with it.

If you want to bring your heat level down to 1 without spending cash; just beat a Job you've completed over again; you'll notice your heat level has decreased to 1; use this trick especially when your heat level is 4 or 5.