I'm pretty sure this achievement glitched on me. I'm kinda pissed. The three kills don't have to be all at the same time right? Within 4 seconds of each other... I've done it naturally a couple of times and I cheated with a couple friends just to be sure. It won't give it to me. Anyone else have this happen? Anything a guy can do to get it to work? A trick perhaps?
Oh well. It's not the first game to hold my cheese from me.