Start up the traffic desk case "The Driver's Seat" as it is a very short case to complete. Once you take control of Cole Phelps, open up your map and find the location of the Phantom Corsair, a hidden vehicle that is located on the corner of Traction ave and 3rd street. It is almost at the bottom right hand side of the map near the Los Angeles River. I am adding a picture to help with locating it.
Once you get the vehicle, drive it and crash it into another vehicle at high speeds so that you can catch the engine of the vehicle on fire, effectively destroying it. Now what you want to do is travel a few blocks away from where you got the Phantom car from and then travel back to it to find that the vehicle as spawned back at the garage. Repeat the step of crashing the car and going back to the garage about 6 times, I did 8 just to be sure. After crashing the car at least 6 times, complete the case and you should unlock the achievement at the end of the case.
Note: If you destroy a Phantom and find the garage empty when you go back, have your partner drive you a few blocks away and then return.