Dawn of the Dead in 2008?
They (walking corpses) did not stand a chance, just take a look at the Left 4 Dead Achievements, that I wracked up.
Brain Salad Make 100 headshot kills. 15 Acquired 11/22/2008
Hunter Punter Shove a Hunter off of a pinned and helpless Survivor. 10 Acquired 11/22/2008
Dead Stop Punch a Hunter as he is pouncing. 10 Acquired 11/22/2008
Mercy Killer Survive the No Mercy campaign. 15 Acquired 11/22/2008