Assassin compact car	Get 15 Takedowns
Assassin muscle car	Get 30 Takedowns
Assassin coupe car	Get 60 Takedowns
Assassin sports car	Get 100 Takedowns
Assassin super car	Get 150 Takedowns
Classic hotrod	Get every special event postcard
Custom compact car	Get 10,000 Burnout Points
Custom muscle car	Get 25,000 Burnout Points
Custom coupe car	Get 50,000 Burnout Points
Custom sports car	Get 100,000 Burnout Points
Custom super car	Get 200,000 Burnout Points
Compact DX car	Get 4 Gold Medals
Muscle DX car	Get 10 Gold Medals
Sports DX car	Get 25 Gold Medals
Super DX car	Get 32 Gold Medals
4WD heavy duty	Get 10 Million Crash Dollars
4WD racer	Get 2 Million Crash Dollars
B-Team van	Get 15 Million Crash Dollars
City bus	Get 70 Million Crash Dollars
Heavy pickup	Get 1 Million Crash Dollars
Delivery truck	Get 20 Million Crash Dollars
SUV deluxe	Get 5 Million Crash Dollars
Tractor cab	Get 30 Million Crash Dollars
Oval racer	Get every signature takedown
Fire truck	Get the ten crash headlines
Modified compact car	Gold medal in the Waterfront Face-Off
Modified muscle car	Gold medal in Mountain Parkway Face-Off 1
Modified coupe	Gold medal in the Alpine race
Modified sports car	Gold medal in the Continental Run Face-Off 2
Modified super car	Gold medal in the Golden City Face-Off
Dominator compact car	Gold medal in the King of the Road Face-Off
Dominator muscle car	Gold medal in the Lakeside Getaway Face-Off 2
Dominator coupe	Gold medal in the Frozen Peak Face-Off 1
Dominator sports car	Gold medal in the Alpine Face-Off
Dominator super car	Gold medal in the Dockside Face-off

Need for Speed Underground vehicles:
Get gold medals in every crash event. Then, at the vehicle select screen, hold the black and white buttons.