I was trying to get the Guardin' Gnome achievement, i won the Gnome from the Shooting Gallery, i was in the safe room of the Barns level, and when i accidentally dropped the Gnome trying to see which gun starts out with more ammo (SPAS-12 or the Auto-Shotgun), and i dropped the Gnome, and i think it went through the wall to the right of the pile of ammo, cause i lost him, and outside the safe room, between the wall of the safe room and the fence, he was stuck, i couldn't get back there
Also, next time i play Left 4 Dead2 , i'm gonna try and get the achievements for beating Dead Center (Cause it didn't give me it), Swamp Fever, Hard Rain and The Parish (On Normal cause i can barely play on Hard or Expert :c), anyone want to join me?