Anyone else going through quite a hard time getting the Protector of Tristram achievement? Surprisingly, I managed to kill all the unique mobs in just a couple of runs, except Goldblight of the Flame, who spawns in lvl 10. I’ve done 6 runs just to get to lvl 10 in hopes of finding and slaying him, but unfortunately he hasn’t spawned for me yet. I suppose it could be worse (e.g. having to kill one of the uniques in the final levels), but still it is becoming rather silly. Good luck out there.
Just keep on trying. I can’t remember which one it was, but one year I missed one single specific enemy for one of the achievements. Sadly, I had to wait for the next year to get it. Sometimes, the RNG gods simply aren’t on your side, it seems.