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Sadly, I think I'm most proud of "It's over 9000"
I would say that the level 85 achievement stands out because while leveling is easier now, it's still a pain to do. This was especially true to my mage since after every fight I went oom like crazy. It reminds me of leveling a shadow priest in the 40-60 zones. Once I got achievement I was thrilled no longer having to grind levels in order to do raids and such besides grinding for gear but I find that more fun.
the achievement that i'm most proud of is since it took a lot of time to complete
I'm going to have to go with my Loremaster achievement. I got it pre-Cata and the experience was amazing! I loved learning the lore about the zones I had skipped. I enjoy showing off my title and tabard whenever I can :)
Avast Ye, Admiral! a couple years before it was an achievement. It was cool hanging out in Org with the hat on and blood parrot out and have people ask how to get the hat. Too many have it now though, just a stepping stone to Insane in the Membrane that I'm still working on.
Twenty-Five Tabards is one of the best, before Cataclysm it was quite hard to get that many tabards and the reward it's very good too, the Tabard of the Achiever is awesome.
Realm first "Algalon the Observer 25man" Most epic fight of my life and the congratulations we got as soon as we got back to ogrimmar was just unreal, it made me very happy.!
Most certainly would have to be .I was a raider during my later school years, but as I finished my university degree, my time became precious, and WoW was the first distraction on the chopping block. I sadly put my account on a temporary suspension, eager to one day return to Azeroth. I made my way into my post-graduate Masters degree (Education), sending me into schools as a History/English prac teacher. I was reminded of WoW when students attempted to sneakily play the game in the background during computer room sessions. I returned to WoW in-part - a little bit here and there. As I was unofficially a 'casual', I didn't have time to return to raiding or the like. Instead, I started collecting minipets and seasonal achievements. Fast-forward to a year later, and I triumphantly received my 'Reigns of the Violet Proto-Drake'. It's my crowning achievement in WoW - something I was able to achieve without spending heaps of time away from being lesson planning and marking assignments. Whenever I'm in Orgrimmar (for the Horde!), I'm sure to be floating on my Violet buddy, admiring the changes and appreciating the time I now can spare for Azeroth!
Insane in the membrane is my favorite, ever since i saw that title on wowhead I have been trying to earn it.