|For this achievement you need to have the most kills and be on a winning defense team. This doesn’t mean the best K/D spread, just kills. I’d recommend setting up a game with a 3 minute time limit. The less time the enemy has to finish the objectives the better the chance defense has of winning.|
The best way to pick up kills is to mercilessly throw yourself at enemies with a shotgun or sub-auto weapon while throwing your frag grenades where you think the enemy may be. Obviously you shouldn’t expect to come out with a positive K/D spread but hopefully you might get off enough kills to be the “best” on your team. That or you could set up a match with a buddy, kill him for the most kills, and then win.