Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
In the campaign on Tsavo Highway, shortly after the second chapter begins, there is a long building to the left that has Trip Mines in it. Grab one of these and proceed to the next area. Here there are Brute Choppers trying to kill you. You will need to attack the front end of the vehicle for a bit until about two small pieces fly off. Once this happens, it should be weak enough to kill with the mine, so place it down and step behind it, waiting for the guy to try and splatter you. It may take a few tries, but just reload the last checkpoint if you fail.
This video shows where and how to attempt this, just jump to 4:40 and see how they do it: