This is a cumulative achievement so it doesn't need to be in one game.
1) Create a class with promethean vision as AA.
2) While in a match get a shotgun.
3) Get inside the buildings of a map and keep an eye at the radar. When you see some close use promethean vision a kill him with the shotgun. Note that you should be crouching so people do not detect you with their radar.
4) Repeat this 5 times and you got it!