I'm most proud of I Smell A Giant Rat. It took me about 2000 tries in the Dalaran sewers to get it. Man, I'm glad I never have to do that again.
Glory of the Icecrown Raider, for sure. I had a monsterous time getting down the Lich King during Wrath, due to an extremely long string of bad luck, so when I finally got all those achievements and the Frostbrood mount, it was a BIG deal for me. Plus I love Darion Mograine and getting a letter from him was kind of cool.
Close match between The Immortal and the Reins of the Raven Lord achievement. I would say the Raven Lord since I went through that place at least over 160 times, but the Immortal wins since the Raven Lord is so common now.
my favorite achievement ever is Immortal no more . Just because I enjoyed killing Tyrande.
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Mine is Putting out the Light, where you need to kill Prophet Velen. I know it's quite easy now, but it was done at level 70. We did it in a server that had a ridiculous ratio of 60% to 70% alliance dominance and at that time we needed 2 raid groups to kill him. At the end of TBC, we had so little horde players that it took hours to make a group for an instance and it was really hard to find a group to raid with. To have actually arranged 2 groups to kill 1 alliance boss, while having an arena 5v5 team just in charge of keep the allies at bay really boosted the Horde's moral on the server. I still have screen shots and we can see the alliance trying to kill the healers and people complaining that they still hadn't been able to get a single hit on the boss, since it was attuned to lvl 80.
I'm very proud of my level 10 achievement. I put a lot of time and effort into it, and it really paid off.
Shave and a HaircutWhen i got this achievement back in 2009, that same day I actually wentout and spoiled myself, not cheap either!But, I felt like a new person and most of my friends didn't recognised meand some were shocked haha!
I love the World Explorer, it became so much easier with the flying mounts for Kalimdor. But I did it before the Cataclysm hit. :D
I love my Loremaster achievement. The title alone show my patience and hard work on getting it.
Despite how easy it is to get, I have to go with Universal Explorer. I spent a lot of time even before achievements were put in looking for all the hidden nooks of the world, from exploring old ZG to the Ironforge airfield, even simple-to-reach gems like the ruined dwarven fishing camp in Winterspring that would eventually find use in the Scepter quest lines. While the achievement itself is a bit underwhelming comparatively, it was still one I enjoyed getting instantly and a title I wore for a while.
Karazhan for purely sentimental reasons. Kara is still my favorite raid and clearing it with friends resulted in some of my best WoW memories..
For me it's Hand of A'dal, since we worked for it together as a guild, and also because it basicly sums up the great time I had raiding in TBC with my guildies.Glory of the Icecrown Raider(10) is a close second, though, for similar reasons, and because I really, really wanted a frostwyrm for my DK.
The first time I level capped. It was during wotlk, and because I didn't have much time to play it took me about 9 months. I was so excited as I got close to it, and then elated when I achieved it. Sure, it's a very common achievement, but I think for everyone it's the one they were happiest to get (first time around, anyway).
Professor.I know to a lot of people it's a pretty mundane one, and now there are even more rares you can get it may be considered pretty easy.But yeah. It makes you enjoy sleep.
Insane in the MembraneBecause it took so much time and work for me, since I'm not good at making gold. But I managed it eventually. I've used the title forever, still wearing it, and proudly.
I think that it was Stable Keeper . i feel so great when i get it, like, ohh ohh nobody here have more mounts hahah... yeah.... lil´ noob whatever ... but also, here is were all started, for me and my mount fanatism, now i already have the Mountain o' Mounts and more than 120mounts. i hope that blizz, have in mind new achievements, and even rewards, now that they added follow up to the pets one