This video shows a location within the south-west Dark Zone where you can farm named enemies to get the 'You Just Made The List' achievement. Enter the DZ from the checkpoint in the bottom left corner on your map, then enter the subway on the left of the street, which is a very short distance from where you have entered the DZ.
They will regularly appear here, but if not, you can just exit the Dark Zone and re-enter to force a respawn. Keep doing this until you get the full 10.
Every time I did this I got a cleaner with flamethrower, apart from the time I did the video (naturally) when I got a sniper. If you get the flamethrower guy, I highly recommend retreating down the corridor as I do here, as he is much more aggressive than the sniper. Use explosive or incendiary rounds to help take him down.
The video is edited together from a couple of runs so my apologies that it jumps a little in places, but it does show the full route.
Note that I did this in Dark Zone level 0-160, for the simple reason that going in at 200+ is really tough nowadays and you are much less likely to get harassed by rogue agents at the lower levels.
You can lower your overall gear level by dumping your high end stuff on a second character via your Stash box.