Every Call Of Duty has its required stealth mission, and the "don't get caught" achievement to go with it. The Jungle Ghosts achievement is somewhat frustrating to get, but check out this video and you'll ghost right through it.
Of course, the other requisite achievement is the "do something difficult on veteran". Piece Of Cake is no Mile High Club though, it actually lives up to its name, and isn't too difficult. If you're having trouble clearing the common room of the oil rig without getting shot, just take a deep breath and watch the video below.
Don't forget to read our review of Call Of Duty: Ghosts right here!