You can do this in Expedition mode during Chapter Replay. Choose The Acropolis chapter for this achievement. (If you're having a hard time, you can choose Chapter Replay Elite to use your upgraded gear and shotgun.) As well, the youtuber who did the video noted to use a smoke bomb. As it stuns them and gives you some more time to line up your shot. Here is a video to help:
credit goes to / XCV // for the guide.