I'd have to say my greatest achievement was obtaining the raven lord, swift white hawkstrider, and the time-lost protodrake all in the same week. Especially since i camped for time-lost for over 4 months! It was a huge sigh of relief and winning the rolls for the other mounts was just icing on the cake ^_~ Now if I could just get my hands on Rivendare's deathcharger >_<
When I hit lvl 60, getting my pally charger and getting the old pvp title of 'Knight' all back in vanilla wow.
Defeating the Lich King for the first time. The "colorful" language from repeated wipes and close calls attracted the attention of my fiance (wife now). She came over and watched over my shoulder as we made one final attempt, and that was the time we won. She sat and watched the end cutscene with me and found it so interesting that she asked if she could make a character. Eventually she got her own account, and we still play together today.
The thing I've been most excited about acquiring was in TBC when Black Temple was just released. At that time I was a really hardcore raider and my guild actually tried to become the first in our battlegroup to down Illidan, but we failed - miserably actually as we were two days late when we got him. Instead a warglaive dropped for us and I was the very first in our whole battlegroup to wield a Warglaive of Azeroth!
In game I have been most exited to achieve killing all of the Cataclysm raid bosses on Heroic difficulty, (ToT4W HC, BWD HC, BoT HC, FL HC and even DS HC). As well as earning all of this, I also got my hands on Drake of the North Winds from Al'Akir and the Pureblood Fire Hawk, but unfortunately, the Life-Binders Handmaiden did not drop. I also finished the first part of the Tarecgosa staff quest which made me really proud because all of this was achieved in just 1 reset, (3 days to be exact).
I wish the Bangle tiger mount was still availble. I tried forever to get it. Horde mounts are lacking.
Getting tree form on my resto druid main back in TBC. Second best? /dance-ing after shifting into tree. :)
Our second Flametalon of Alysrazor drop, had it a few weeks apart and I won the second time, had to double check to make sure I wasn't imagining it.
farming for the insane title for sure. even though im not into titles much and it seemed a bit of an anti-climax at the end, grinding for it was loads of fun and involved help from many players id met over the years.
My favorite accomplishment was fishing up Ol' Crafty, Old Ironjaw and Mr. Pinchy
Legendary daggers after farming DS over and over for months :)
cataclysm legendary daggers was a big win for me
For now I'm stronger than GOKU!
Glorious Breastplate and left binding of the Windseeker.
Even though I did it at 90, i think acquiring the blessed blade of the windseeker was my most exciting moment!
Getting my time-lost proto drake.
It would be Eggselllent if I got the Magic Rooster Make my life so happy also cant wait till the new patch with them new dinosaur mounts. All have a good tame Gamers.
I had been after the Rusted Proto-Drake (simple, I know) from Ulduar since Wrath, and when I finally got around to doing all of the achievements a few months ago I was very happy to finally ride it.
Acquiring Thunderfury @ classic WoW with the help of my 40-man guild.Thank You!
mountain o mounts was by far the achievement that gave me the most stress, but man that dragonhawk rocks