yes. but its weird. i was on the quest to find the alter and the dungeon he was in looked nothing like the other dungeons and it was full of rare mobs. id say 4 or 5 sets. i wonder how many others got this feat of strength and perhaps i am the first. thus why i am looking for others with it.
its in the cemetery in act 1, where you are looking for the crown, you get these 3 crypts normally, but on very very rare occations you will get one of them called "Development Hell".
all of the zombies, risen, and wretched mothers are named after people in development, and underneath their names it says their positions on the diablo 3 team, somewhere in the back of this crypt Jay Wilson spawns as a named Unburied, and when you kill him you get the achievement.
Yeah, I've got it. I actually "farmed" for it by leaving and resuming the game. Took about an hour to spawn, so the cave seems to be quite rare. The sigil you get for it is quite nice, using it atm. Info about the FoS is out in the internet for quite a while now, really.