3 Dead, 3 3urious
I’m a bit excited by this news, L4D is the only zombie thing I really care about. It trained my wife to be proficient at fps, my mate told me as Bill to my Francis that he had just found out he was going to be a father, plus my favourite/toughest/flukiest achievement I unlocked was on it.

Man vs Tank
Single-handedly kill a Tank.
Unlocked 28/03/2009
On the roof of the hospital at the end of the first campaign all my AI buddies got wasted at once and I got the chance to murder the tank alone without them chumps soiling the kill with their filth.