Originally Posted by jae200
I just grabbed the game last night and got this pretty easily on the way towards infiltrating the school early in the game. You come across a building with a missle launcher and other weapons, then keep going forward, drop down a cliff and into some bushes/trees. There was a caravan of 5 or more enemy soldiers walking down the road in front of me, I stayed cloaked in the bushes with my SCAR and would line up my shots, pop out of cloak, pop a guy in the head and then cloak again. The enemies don't run away but stay right there looking for me and I got the achievement easily.
Just did this this morning in the exact same spot. Only difference was I used the rocket launcher from the radar station above and shot all six of them while they were huddled together. One shot and it popped. Easy.