Beastmaster's Bane Bug

I have on multiple occasions defeated Astaroth before the Amalgam was ressurected on Torment IV in an escalating nightmare dungeon in order to complete the objective “Beastmaster’s Bane”, the objective, however, is not marked as completed? I have seen that other players have had the same issue. Blizzard should look into this.

why did you post a bug report in the general discussion?

Because Diablo 4 does not have a proper bug report system, and the devs have always encouraged us to use the forums for bug reports.

Same here. I killed him alone and with friends, with and without dying. The achivement is still locked.

Still bugged, or at least the wording on how to achive the Beastmaster’s Bane is not clear. Solo or Grp, can’t get this to complete.