I'd say it's the loremaster. WoW lore has always been my favorite part of the game.
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Leeeeeeeeeeeeeroy! leeroyyyyyyyyyyyyyyyy yenkinsssssssssssssssssssssssssssssss thats my most proud of archivement, even when i got icc title i choosed to stay with this, its mine most proud of achievement, i done it with 5ppl and im proud of it cuz usually guys goes in 10-20ppl to get it. we managed it 5man in lvl 65.have u watched video how this achi have made of? look the video here: http://www.youtube.com/watch?v=LkCNJRfSZBUthats why its more epic, we classic guys know all about this guy and that's why we proud to be Jenkins family, no like just icc title witch only says u ahve done icc last boss be4 cata came out ;)
My favorite achiev is prolly son of a... Partly for the name and its fun to do .
I am proud of my Swift Zulian tiger archievement after grinding ZG for a year I managed to get it and that event was the most emotional from all other archievements earned. I got this mount one week before the Cataclysm came out - epic timeing. Since that mount is deleted from the game to archieve that makes it more unique. :)
The "Charger" achievement is my favourite because I had gotten the Charger mount on my Paladin back in the days of vanilla. It was SO hard to get a decent group when you just turned level 60, but it payed off with an awesome mount.The achievement I'm most proud of would be "The Light of Dawn", I've atleast wiped a hundred times trying to get it before Cataclysm, I think I've lost a bit of my hearing too when everyone screamed like maniacs on Ventrilo.
Hero of the Zandalar Tribe, ive had never done any rep grinding for this one so on the last day i cleared ZG with 6 of my 10 chars and got to exalted after all :D
The achievement I'm most proud of is 40 Exalted Reputations, I was one of the first people to get it on the server I was on at the time, shortly after Wrath was released, by this time I'd done almost all previous reputations except Darkmoon Faire, Ravenholdt and the 2 PvP ones.As for my favourite, that would have to be Insane in the Membrane, I leveled a rogue, purely to farm myself Ravenholdt reputation, and spent a long time "sitting" in Dire Maul, one of my favourite zones, and loved being one of the only people on the server to have even heard of Shen'Drelar.
Mine would have to be "The Safety Dance" The Safety Dance (25 player) in 25man Naxx! Guild slaved around for hours playing the "Safety Dance" song for inspiration until we finally got it rouhgly at our hundreth time. Karaoke Anyone?
There is almost too many possibilities here. Incredibly hard to narrow it down. Yesh. Do Guild Achievements count? No? Okay. In the end the one I'm most proud of is a little odd. Karazhan. This only because it was done completely solo with my DK back in Wrath long before the Cat overhauls were introduced. Started out as my weekly attempt for the mount and it morphed into a wtf lets do this. Then it became a weekly solo of Kara. I tell ya chess can be annoying sometimes when solo'ing >.>They nerfed how much gold the Philanthropists dropped because of guys like me :(
Oooooh thats a hard one but i think my most proud achievement will have to be Looking for Multitudes the 100 random players oneI was never a pugging person:p Hated it actually. i tend to get over stressed and badpug experiences have made me wary of joining one but i knew i had to get that pet! I was smiling for days after i got that achievv with my little pug by my side, and thought i still tend to dislike pugs, im more willing these days!