I don't manage to do this achievment. I play elementalist, and all my CC skills are on one attunement while my burst skills are on another, which makes it very difficult to damage the mob in time when the cooldown becomes more than 50 seconds. I have a full zerk ascended stuff and can't afford to buy one with others stats... But I don't have any problem with changing my talents or utilities. Any idea how I could pass it?