This post was from a user who has deleted their account.
Getting exalted to get my netherwing drakes. That was a pain in the butt!
As far as achievements, getting rank 14 during old school vanilla PvP.As far as acquirements, it would probably have to be the Time-lost proto drake. I didn't end up getting him until towards the end of Cataclysm.
Leveling to 90 and getting the new mounts.
I've got to say, when I got my Reins of the Phosphorescent Stone Drake, I was extremely happy. It took weeks and months of farming, but it was worth it. It is the only mount I use on my Shaman. Other than that, taming Skoll was second.I think a Tyrael would top it though.
Netherwing Drakes. This was the first big challenge I decided to face. As soon as I turned 85, I didn't gear, I didn't do anything, I just rushed back to the outlands and farmed those eggs like crazy. I was logging in during my fifteen minute breaks at work, during my lunch hour and even at 5AM, before heading to work just to see how many more had spawned so I could collect them. I realize now that the achievement wasn't hard, just time consuming. But as a noob, then, it was a big deal for me and I was so proud to fly around with my Malfas (Reins of the Purple Netherwing Drake).
Vial of the Sands
The thing I was most excited to get in WoW was the Twilight Drake. Wasn't expecting it; total epicwin moment. (=
Obtaining the Skull of Gul'dan, so much lore in it. It is such a great feeling to carry the head of the greatest warlock in history around in my pocket.
Getting onyxia drake during level 80 during my 2nd solo was one of my happiest moment. The pride on riding it with everyone cheering me.
The Kingslayer title. I love collecting pets, mounts and achievements but there hasn't before or since been a more epic moment than when my former raid team downed Lich King for the first time, earning us Kingslayer titles which very few players had on our server at that point. It felt good to have that title when it was still considered prestigious but even more importantly, it was the culmination of a long journey for our team. We wiped on the LK more times than I care to recount but getting him down that first time felt like pure magic. It's one of the few titles that has a nice personal meaning to go along with it. I remember all of the whoops, hollers and celebrating going on in vent and that's what I think of when I see the title.