Ive been trying to play story on hard thinking my ai would pick up some slack while i work on the solider but il i got was shot in the head as i turn around a cornor to protect the person doing the objective. . . .wich also has no faith in you protecting them if a enemy come with in 30 feet of the person he stop ,runs around like a mad man till i kill the person :ahhh: i want you to shut up and keep working :brokencomputer: while my minigun and turret trun people into fine grits of dust is that so hard to ask.
Pretty much 90% of the kills in the killfeed are headshots on hard, and the bots snap to you. If you want the achievement/trophy, you just have to push through that.