I'd have to say getting my violet proto drake, I had taken a break from WoW and returned to find that I only had a few achievements to get it. BUT I had to wait till the Halloween event to get them and then wait again till Christmas to finish it off. Getting it by then was by far the best feeling in the world. Now it's collecting as many pets as I possibly can.
Well, I had many moments of excitement within my 3 years in WoW. The first really great moment I remember was in 3.3, when I gathered 10 ppl raid with my guildies, and after two months or so we finally killed LK 10 normal(!) and we were 19th on wowprogress on our server among 10 ppl (and it mattered back in WotLK. mattered nothing really.), and we were sooo proud of it lol. And my last great moment was getting Challenge Conqueror: Gold recently.
I would have to say i was when I got my Golden Drake and then The Headless Horsemen mount. Also when I hit 1k gold then 10k gold. Also just having all this time to play with my brother. Learning everything there is to the game. Id have to say that is the most exciting and fun.
the phoenix is really rare
Leveling to 90!
For me, the biggest achievement/accomplishment that I've found in game was actually finding my husband. We met playing WoW and we have done a lot of the achievements together, including the 10man ICC Bloodbathed Frostbrood Vanquisher mount.
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Some have it. Some don't... LUCK! My happy moment was when i finally got the Raven Lord after clearing the instance 163 times. Took me around 5 month to finally see it drop. Almost gave up, and started wonder why i bothered to count the numbers of time i been there. Didn't make it better to hear some friends get it after few tries, in that time. Little hard to be happy on their way =).
Make all quest, and become loremaster :-)
Deathcharger's Reins, took me 142 runs to get it. I detest stratholme now, but I would do it all over again if I had to.
One of my favorite things was probably getting the Ultramarine Qiraji mount from archy after having no chance to get the Black one
I've had quite a few favorites... I guess the current one is lvl'ing my lovely monk along with the pet battles! :)
Stopping at pve and switch to pvp :p
Leveling all my pets to level 25...all rares of course!
Vial of the sands took me ages to get it!:)