I've only got this achievement left for my rusted proto, so I'm trying to solo her. And I can survive as an elemental shaman. Heck, I can survive with 10 of the guardians wailing on me.
Did they hotfix her enrage? I've read all these posts on wowhead about the natural enrage from waiting 15 minutes does let her flame-breath kills count toward the achievement. However, I've tried this 3 times with 6-10 guardians (melee dwarves with 1h axes) all dying from the fire. Yet I've gotten no credit, and I was not auto-attacking at all, or had lightning shield on.
Do I have to do it the old fashion way? Or am I just doing something horribly wrong?
Btw, it is definitely on 10M, and I'm definitely looking at the 10M achievement. The credit isn't going up. I've got 13 saved up from when I did guild runs in the past (weren't achievement runs).
EDIT: I just made HER kill 2 dwarf guardians, and my credit did not go up at all. However, I have gotten 2-3 credit in previous attempts. It seems that majority of the time, I do not get correct credit, while some times I do?
---------- Post added 2013-06-27 at 06:16 AM ----------
As another update: I just got the achievement, so I don't really need any advice. But I did notice a lot of the kills were not creditted, so I dunno if there is a limit of the credit you can get per flame-breath, but it was fairly frustrating gathering 5 mobs, getting them to ~13k health, then watching them all die while only getting 2 credit.