Easy Negative Eugenics

Very simple, I'll get right to the point. Negative Eugenics requires you to kill 4 enemies with one single RC Car explosion. I struggled a LOT with this one until I switched my brain on and found an easy method.

Some of the contract missions require you to hack laptops with no enemies around, however the enemies will arrive in vehicles shortly after. Hack a laptop, and use the RC car to drive to where an enemy convoy arrives, then detonate under the car to kill everyone in the vicinity. If the achievement doesn't pop, ie. if the car didn't have enough enemies in it, restart from the last autosave and try again. Rinse and repeat, and you'll get the achievement without much hassle.