if you played trough the campaing and dont got this cheevo ( like i did )
Here is an easy way to get it .
just start up lvl 1-1 trough lvl select and about the 3rd car you come across there will be a guy standing on the front of the car.
You have to shoot this car b4 the guy jumps to your car...
I got this on my first attempt in case it didn't work just restart lvl and try again ...
( it is best if you played trough the campaing first to get your upgrades to the max b4 attemping this cheevo )
Good luck :)
I hope this helped some ppl out :)