Guild Wars 2

Done this event twice & killed Taidha Covington both times, yet the achievement remains to be uncompleted

Bumping this for same issue. Completed the event, killed her, looted the chest. No achievement awarded.

same problem
finished with gold twice, looted the chest but didnt get the bost reward

Just completed this with a friend. Killed boss, looted chest, gold reward.

But no ingame achievement