I'm having trouble with the part of the questing achievement 'Dread haste makes dread waste', specifically the might of the klaxxi part. I've done all of the quests I can find. I've got to as many hubs as I can think of, but nothing. I've got no quests in the dread wastes, and the might of the klaxxi is the only part I need. I looked this issue up on wowhead, but the only advice given was to do with the recipe scroll, which I already found.
The only chain I'm wondering about is Chen's chain, when he's finding his family. I followed him up to a certain point, but then he gave me no other quests. So I'm really confused. Any help is much appreciated.
I've got three paragons left to awaken and the last one I got was Rik'Kal the dissector, if that helps.