Friend of mine told me that one of his friends got Death's Demise in a PUG that was doing 25 man Ulduar drake on one of RP servers, he didn't tell me toon name nor the realm (to be honest I didn't ask nor was able to remeber them anyway - we were in Pub).
So question is, are there any realms that don't have this achievement obtained, if yes what is the easiest way to track them? I would totaly level new character just to get this title on my US account since I don't play EU anymore because of changing place of residence and Blizzard doesn't allow to move toons between regions (I have Death's Demis on my EU paladin) and even if they add account wide achievements I think it still won't fix it because even now RealID on EU and US totaly separated - you can't see or add friends that play EU versions of games if you play US version of game, you can only see them when you play EU WoW or SC2.