Have anyone done this achievement? Nothing I can do coz npc never active bar ever and now it is more than 1 hour. It sounds like bug to me and I talked with some about it!
I don’t think it’s a bug, its just a really poorly designed achievement and world quest (who’d have thought right?!..). The contraptions once built last for hours so you basically have to camp them with the ore, ready to turn it in.
They won’t fix it anytime soon as there is a myriad of actual bugs that are more important than this on their list.
I’d also love to see some kind of response from Blizzard regarding this, as most of the time they are quiet as a mouse when it comes to issues like this relating to achievements.
People complain about this achievement, finally I am done with it! I hope we wont see new achievement next time! It is absolutely ridiculously!