And I don't mean in singleplayer. I mean multiplayer. Because Glen McCracken is doing just that, trying to reach the maximum level 70 in multiplayer without killing a soul.
How the hell is he going to do that? He uses a riot shield and flashbangs, and gets his XP from grabbing flags in the game's Domination mode.
So far he's reached level 11, having recorded zero kills for 272 deaths. That's a great achievement considering that both the shield and the flashbangs can kill if your target has low enough health when you whack them.
Best of luck, Glen. Because if there's one thing the world needs more than angry men with weapons, it's love.