Requires 6 players.
The achievement description is self explantory, and you can have a player on each team go for the achievement
This is how you set up the game
Have the host select
> multiplayer
> xbox live
> ranked match
> custom match
> team elimination
> find games
> machine gun
The other 5 players select
> multiplayer
> xbox live
> ranked match
> quick match
> machine gun