Mission: Payback
Not that difficult to get really if you change the difficultly to recruit, you get out of the cave and into the Hind then only use LT to fire your rockets. Its worth noting that if you die you can carry on and still get this achievement. Also the rockets are really inaccurate, there are some static targets to hit and 3 Helicopters which can be a pain. the rest of the level you will be able to fly through pretty easily.