Go to all out warfare and ensure that the game mode is Breakpoint. From there, select the Solo/Coop option so that you are only against bots (on beginner difficulty). The map that I recommend would be Manifest based on its small size.
Once the game loads (you should be on the offensive team majority of the times), you can spawn into an offensive vehicle like the tank or LAV and go to town on on as many AI as possible. Keep in mind that some of them will have rockets that they will use so keep an eye out or spawn with a repair tool. If your vehicle goes down, then you can always spawn another one though there are some timers in the game that you may have to wait on but they are not long.
You should get this achievement between 1-3 matches depending on your skill