The achievement “Umbrage for Umbriss” required to complete the “Glory of the Cataclysm Hero” achievement (that also unlocks a cool mount), is impossible to do right now due to a bug or maybe a CHANGE in the General Umbriss boss fight.
The General Umbriss fight is completely different now, the boss doesn’t do the Modgud’s Malice anymore, and we need to kill him after defeating the ‘purple mob’ that he usually spawned. Also, the appearence of the boss has changed too, he’s now with an armor and without wings, back in the old days, he used to have wings and be purple too.
Anyway, a lot of achievement hunters tried to do this achievement (i’ve seen it on youtube people complaining about that in the comments), but it’s impossible right now cause the boss don’t do the necessary spawn mechanic for us to complete the achiev, there i’ll be a fix for it or no? I hope so.