PeteMach

Hi guys, this one is driving me insane! It requires 5 headshots and 80% accuracy. On the first replay run I got headshots registered, but no accuracy, as I missed one shot. I did many more runs with all enemies killed with headshots, without missing a shot, yet nothing registered. I am wondering; WTF am I doing wrong? I am ridiculously careful and precise. Its strange headshots got registered the first time, when I was not that much focused. Please advise!! I need this for my last story mode trophy.. I have 45 gold medals, and its getting really hard to get more, as there are most difficult missions left. This was supposed to be easier one..