Zeratul Coop achievement Devolution Retribution again

It seems to me this bug may be back somehow.
All I get is the progress box at 0/200 and no matter what I do with the avatar of Essence or Zeratul, it never changes, never moves! Avatar of Essence’s “Devolution Wave” is turning foes into workers (drones, probes, SCVs) altough sometimes it turns them into something else, and I have killed several of them, I expected that progress box to at least tell me how far am I from my goal but it doesn’t do anything. What could be wrong?

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