First, you'll need to find the Ford F-150 SVT Raptor in one of it's 3 Jack Spots. (All 3 locations in video below)
Next, find a cop and ram them to start a pursuit. More police will keep spawning behind you, so do a 180 and drive into them for some head-on takedowns. As your heat level increases, even more will start spawning behind you, so turn around and repeat until the achievement unlocks.
If you somehow run out of cops to takedown, stay within the red/blue circle and wait for more to come.
I show you how to do it in less than 2 minutes below.