It more likely due to to your team you need GOOD players like myself :) I got Endure last year in two tries at the Game preserve level it has the most cover and the most VEHICLES that is your key to this achievement. I need Deja Vu and HALO 3 last level achievements ill help you get this one but I would like to get those two in return if any body wants in
GEE OTTO send me a msg on XBL