It`s easier with a boosting session. You will need 5 gamertags on the match (guest account doesn`t count) and the DLC MAP PACK 2 (you can get playing on DLC MAP PACK 1 as well).
Set up a CTF or any other Elimination Map (my first call is CTF so you can get on this same round other cheevos from DLC2). Set 10 min match also.
Have one team with the players that will get the achievement . The players on that team will need to kill 3 players each at least and wait 10 minutes to the player be over.
Simple as that. Change the team so other players can get the achievement.
Update: I'd like to add you can do this solo, just load up a DLC co-op, map any co-op mode and survive
Posted by S4LUT3t0LUN4CY