Forum:I killed 4 Behemoths, Fawkes did

I killed 4 Behemoths, Fawkes did #5 on his own at Evergreen Mills from top of the cliff while on guard duty...

Why can't i get my award for this achivement! Do i actually need to take the fatal shot? --- I'm sure you do it makes sense if you think about it. http://fallout.wikia.com/wiki/User:Rohtvak ---