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The achievement im most proud of would be glory of ulduar raider 25 I remember working on mimiron for weeks on hm before we took him down and the joy.. oh the joy when we got him down, we all screamed like crazy and it would have to be my most awsome moment in my wow career so far, and my favorite achievement that I thought was really fun to get was the saftey dance in naxxramas when you could stand in the corner and take no dmg from the poison(pun intended)
Gonna have to say my over 9000 one.
My favorite achievement would have to be Mountain o' Mounts (Mountain o' Mounts), due to the long time I have spent achieving this. I have not gotten off of the blue dragonhawk yet :D. Also an FYI, my last mount was the traveler's tundra mammoth, so that hurt my pocket...
For me, it's probably Glory of the Icecrown Raider (10 player). Having raided since vanilla with the same group of semi-casual players, finally reaching and completely the true end game content was a great feeling of accomplishment.
The Justicar has got to be the achievement and tittle that im most proud of, it takes quite alot of time to earn it, not to mention the patience of a saint if you play alliance hehe.
Watch Him Die.I remember the night we did this. Although it began in the evening, we tryed the first straightforward tries with just nuking the boss. We quickly realized that this wasn't the way we could get this done. We then tried other tactics.Nuking the watchers in a predefined order - wiped us about six times.Nuking the little adds (first we nuked the fixating mobs - four wipes, then tried the casters =>) - wiped for about five times.Nuking everything random - wiped us one time. We learned pretty quickly that one time.AoEing everything - yeah, well, that one was really fun. It all went well till we let our healer die, after that is was a pretty fast death.Until here we spent hundreds of gold, about five hours of our precious time, discarded 20 strange tactics and switched our healer. Fun fact: I told our paladin tank (we were all guildies) to shield wall once in a while to reduce our chance to wipe. Turned out that he didn't knew the change to Divine Protection and therefore didn't use it for the last five hours. Hilarity ensued.About one hour later we finally did it in a magic try which involved godlike gameplay from everybody involved. Note: we did the achievement when we still had really low gear and a rather bad group setup. But it was really epic and we were one of the first groups on our realm to accomplish it. I always recall that night with a laughing and a crying eye.And then there was Headed South, which also involved many hours and kinky tactics. But that is another story for another time..
Hours and hours of memorable farming (*_*)
Onyxia's Lair (Level 60) acheivement to prove that i did it before onyxia decided lv up to lv 80 :P.
The now feat of strength that took me forever to do back in vanilla: Dreadsteed of XorothThe farm, the frustration, an epic battle and finally a reward well worth the grind!
My favourite one is probably Amani War Bear, with Hand of A'dal as a very close second.