Now I could be playing it wrong but I can't see how. In HoT story part three, Roots of Terror, you reach the end of the instance and there are three achievements to kill the chak in the pit. These range from 1 chak to 10 to wiping out the full pit. I have done this, a few times now and every time the instance ends still saying I am eligible for the "Chak Killer - Master" achievment yet there are no chak left anywhere. I've killed them all after speaking to the group, before speaking to the group, after taking each different lane. Am I missing something or is this bugged?It doesn't say anything about staying alive throughout, presumably you can die and keep going?