First of all, evening, I'm Knight, and I will be instructing this guide. 


The first thing you want to do is get to the mission Acceptable Losses. On this mission, grab the M14EBR.


And on this mission there are multiple chances to grab this achievement. Go through the alley on the left of your spawn, kill the guy with the smoke, then move to your right and you should see 2 guys talking next to an air plane. Line 'em up and knock 'em down as I say.


More of a speed person, or trying to complete the mission? Next to the first C-4, the helicopter, march around the two trucks line 'em up and knock 'em down!