The challenge achievement With Friends Like These requires you to "Kill 30 enemies from the death explosion of a single Grotesque, Harvester, Horror, Aomination, Bile Crawler, or Spine Lasher."
Obviously, followers and minions are going to get in the way here so it's assumed they're dismissed. As I understand it, the idea is to try and kite 30+ enemies close to one of these exploder enemies and then blow them up with the explosion from killing the exploder. I would think to use Monk, Wizard or Hunter as Barb abilities would need fury and Doctors rely on their minions quite a bit and crowd control abilities that don't damage or do little damage in order to herd the enemies. I cannot seem to get 30 enemies to die this way. Either there aren't enough enemies within range or they don't die from the explosion or I'm missing something as to why this isn't happening for me.
Where is a good location to do this? What is a good strategy to do this? Are there particular classes/skills that would make this easier?
The ideal answer would be class agnostic, but as long as it is simple and it works, that's good enough.