I just completed this achievement the other day. It's actually quite easy.
When the Ichoron splits, someone runs over to one of these light fixtures and clicks it. This will cause the room to electrify (like at the start) and kill all his spawns. Repeat this 2, maybe 3 times, and you should have him down in no time.
Now, do these fixtures also work for regular mobs? Like with the groups spawn? Could someone stand there clicking this fixture to do DPS? Like say the healer? :)

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