Sorry for posting in the wrong topic but i know that the Halo Wars dont get much attention. Trying to get the Killjoy achievement and was wondering if anyone had any tips… (trying to get all achievements for every game 
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I had the Prophet of Regret as the enemy and built up a lot of units, then I sent them at him in small groups so he would attack them with his special power.
It takes awhile for the Disruptor to regenerate, so make sure you have adequate defenses to repel any attacks.
Get a friend to help you out. That’s how I ended up doing it.
I’ll help you out if you want, I’ve got the DLC and achievement and I know how much of a pain it is to get.
GT is Rknb117, message me if you’re interested.