Insane in the Membrane Is my favorite by far.
It's been some time but my favorite one was On Wings of Nether. It was grinding but had some really challenging encounters/quests defeating the different flight masters. And then when you finally get the achivment on your way to get your first drake you get to ride on that huge dragon into the sunset of Outland. It was Awesome I still have the sceenshots of that flight! Great reward, great challenge and great story line.
I really love this Make Love, Not Warcraft is like laughing in their faces :3
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The Undying. As a Death Knight i wanted The Immortal because who wouldn't want an immortal Death Knight? But undying fits good too :)
I'm one of those crazies that reads all of the quest text when I'm romping around Azeroth, so when I first got the Well Read achievement -- finding all of the books on my own in various dungeons and libraries around the world -- I couldn't have been happier!
Glory of the Icecrown Raider (25 player) !I hope i get that this week, and will me my favorite mount on all Azeroth everrrrrrrrr
My favourite achievement has to be Mountain o' Mounts I spent months after this achievement and it was worth it for the red Dragonhawk mount. Plus it really annoyed my Blood elf friend seeing my Tauren riding it. ^^
Battlemaster, was shacking so hard when I thought I was gonna get it. I even dc'd after I got it. Was so happy I could almost scream lol!
I'd have to say, the one I'm the most proud of would have to be Deathcharger's Reins.I was the first one to pick this mount up on Arthas, about 6 months into the game and I dinged 60 on the run I won the roll.
I'm most proud of the raid team I lead getting Silence is Golden - not because it was particularly difficult to pull off, but because we were the first (and, at the time of this posting, are still the only) guild on our realm to have gotten it.For a roleplaying guild that's never been any kind of a "hardcore" raiding guild, I'd say that's pretty damn good and I couldn't be prouder.
Exalted with argent dawn, argent crusade. I play a paladin and love the lore around stuff so anything that can give me more of a feeling of belonging to the game world.
I usually get very little play time, so my Knight and Legionnaire PVP titles for my Alliance mage and Horde druid are probably my favorite, given the time investments.
Easily the Immortal Title.