I wouldn't say this is particularly difficult to do on God Hard, but man fuck the snipers. They just really like to headtap you and insta-kill you a lot! The first couple of fights was good, and I was lucky to have the second Romanov instantly died by some reason. Maybe the soldiers just had their MLG aim on today or something. I also realized you don't need to kill the two Transporters, as they drill machine comes up anyway so just survive is good enough. But man the ending was clean, which is probably why I even beat Zaarock in the first place by 4s!