There are 7 Unique Vehicles that can be found in the game. However, only one will need to be found and driven in order to unlock this achievement. I made a video on where to find all 7. In order to unlock Dangerzone you will need the vehicle hack unlocked. I also recommend having the vehicle hack unlocked for the Wrecker as well. It isn't needed for this one but will make it a little easier to obtain.
Rainbow Missile- 0:05-1:17
Flip Wagon- 1:18-3:29
Danger Mobile- 3:30-4:57
Ice Cube- 4:58-6:10
Mountain King- 6:11-7:55
Dangerzone- 7:56-10:53
Wrecker- 10:54-12:15