Game Breaker Achievement in Halo: The Master Chief Collection

This achievement, as well as "Requiescat in Pace" and "Run and Gunned" can all be earned in a Custom Game with a second controller or another player.

Regardless on whatever map and game type you choose, both players should meet up in a centralized location on the map and then begin to trade kills. The requirements for these three achievements are straightforward, so there isn't too much detail to explain.