Since this game became Backwards Compatible and GwG, you can get this and the other multiplayer achievements solo, so long as you have an Xbox One, an Xbox 360 and an alt account (which can be a Silver account).
NB: For this to work, you'll need to have your Gold account set the Xbox One that you'll be using to it's home Xbox in order for Gold sharing to be available on there to your secondary Silver account.
(Note: If you didn't pick this up during GwG, you can still use this solution, though you'll either need a purchased digital license for the game, or two physical copies).
Have your secondary account launch the game on your Xbox One. It will be able to join multiplayer via your Gold sharing main account. Log into your primary account on your Xbox 360 and launch the game.
Set up for a private match, and invite your secondary account to the game. Set up for a Team Disintegration game, and set the score/time limits to the lowest possible.
Run around on your main account killing your secondary account until you either hit the time or score limit. At the end of the match, the achievement should pop.