I've had quite a few favorites... I guess the current one is lvl'ing my lovely monk along with the pet battles! :)
To me it has been beiable tong show my wife a whole new world. I played WoW from around launch through 3.2 or so before I had to quit playing. I started a career, got married... and low and behold, one day my wife decides she wants to start playing! so I dust off my old account and we get her signed up and I have had the time of my life introducing her to Azeroth (and Outlands!). It has been a journey we have been able to share together. Our newly created characters are now getting close to 90 and I can't wait to see what level cap will bring our way. We are both very into pat battles so a Tyrael's Hilt would be really sexy (seriously, I might get some by winning.)
Stopping at pve and switch to pvp :p
being one of the first on my server getting my dreadstead, everyone wanted me :)
Leveling all my pets to level 25...all rares of course!
Vial of the sands took me ages to get it!:)
Insane in the Membrane... ugh if i wasn't soo lazy
Full clear T14H before T15 comes out :(
To try and obtain 150 mounts for the Jade Pandaren Kite.
To complet over 9000 achivements points at the begining when was verry hard to attend!
Since I got my cloud serpent yesterday, I am now most excited about having tier 3 season twelve PvP gear. It is by far the coolest looking set yet!
Getting the Celestial Dragon pet before my rival pet collectors, and shooting up to #1 collector on my server!
I would definetly have to say Killing Illidan, and getting my Warglaives on my rogue!
Gathering all my priests tier gear from Ulduar. Probably my favorite xmog gear for priests.
When I first killed the Lich King, Arthas has always been the huge villain in my eyes and when I watched the cutscene after the big fight..... I will never forget that feeling of accomplishment I have felt in a game.
My biggest.. and best accomplishment, is my druid. I have had her since Vanilla wow first dropped and I have played her as my main since. She has titles and achievements that you can't get anymore. She is my pride and joy.
I think getting my talbuks back in the day was the most exciting thing ever. That rep grind seemed to take ages. They're so graceful. ^_^
The first defeat of Nefarian in BWL back in the pre-TBC times with my guild.
To be onest...Level 90 !