I am not trolling, he was visiting his old home and realised that Blizzard decided to remove it from the game after rethinking the zone map and made his cave just "disappear". He, then got very mad, and flew through the Dark Portal and began engulfing the rest of the world in flames until being put into a deep slumber then coming out again to say "hello" and...oh god I am trolling. Sorry :x
As we all know, you get this by being in the lucky zone that Deathwing decides to destroy entirely. My question is, once Deathwing becomes a raid boss, won't everyone wiping on him instantly get this acheivement?
No, and once your server has killed him, you won't be able to get this achievement. At least that's what I've heard. However, I know for certain that you can ONLY get this achievement via dying from his fire as he flies over a zone.