School of Hard Knocks - ugh.
Definitely the guild achievement for catching fish. I remember when everyone in our guild decided to pitch in and take up fishing for a little while so we could nab that achieve, was an interesting bonding experience.
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The achievement that I am most proud of is Herald of the Titans! Its so rare :D
Hand of A'dal is what I'm most proud of getting, one of the most unique titles used and one of the most fun (in my opinion) raids to get into BT.
Oh, that's definitely an easy one: Veteran of the Shifting SandsI did the quest chain between mid- and late-LK, it required a great deal of commitment in parts, even after two expansions. It was very worthwhile when I got to experience awesome things like defending Moonglade from a massive attack, the unexpectedly climactic battle against Maws, and so much more. While Cataclysm is more than I could've hoped for, I just can't get myself to say I've been a part of a better quest chain than this and I'm glad I got myself to get it done before it was removed....Now, if only they added a title along with this excellent achievement. Vaiir, Veteran of the Shifting Sands - that has a nice ring to it, don't you think?
mine would probably be the czar of sporeggar because you've just spent at least 1month collecting mushrooms and killing bog lords then you realize this total Wasn't at all worth it unless you wanted a mushroom tabard and a spore bat companion
The Achievement to kill all the leaders of the Horde, no one seems to make those large raids anymore :(
I was proudest of after 104 tries (before they increased its drop rate) Deathcharger's Reins that was until on 20th try I got http://www.wowhead.com/achievement=880. As far as I could see I was like the 3-4th person to have it on our server at the time. I know people that ran it every time it reset until it was removed and never got it. I managed the tiger on my rogue and the raptor on my death knight and warlock.
It HAS to be I Can't Hear You Over the Sound of How Awesome I Am. Not only does it have the absolute best name, it's insanely hard to get. A just reward :)
The achievement I'm most proud of would definitely be Glory of the Icecrown Raider (25 player) as it's the most recent of the 'hard' raid achievements that I've got. The single most memorable achievement for me in this meta achievement would probably be Full House because of how chaotic it tends to get. :)The mount itself also looks quite nice and it awarded my druid with 310% flight speed. I'd like to make a special mention for the 'newbie' Glory of the Hero achievement though. It was great fun to obtain with 4 friends at the start of WotLK while we were all still undergeared. A completely different pace and scale from the raid achievements but no less fun.
Lol, my Bloodsail Admiral. After a day of epic soloing in Booty Bay, I was so happy to get my title and my glorious pirate regalia. I regret it a little, due to my current inability to use Goblin FPs, but it is awesome.
Building a Herald set of equipment and getting it the week before it was removed, made it epic and so rewarding.
Th achievement im most proud of is Mountain o' Mounts. it took me forever to collect all my mounts and when it came down to 99 i knew it was going to be difficult but i succeded in the end. The Blue Dragonhawk is worth it. i only wish the next achievement for having more mounts had another mount to give away. My favorite out of all 101 i have is my Chopper. Its thanks to Wowhead for helping me get some of my mounts by providing on how and where to get also thanks to players for uploading he information as well.
I'd say my favorite achievement (after actually looking at my list) was The Undying achievement you could get in 10-man Naxx. This wasn't easy to do back before Ulduar came out and after a very long night with my guild, we were able to accomplish it. Even to this day, it's still one of my favorite titles for my main character.
My most precious achievement is Sulfuras, Hand of Ragnaros . This achievement is so precious, I have to hide it from my own characters achievement summary, letting only the guild achievement, Sulfuras, Hand of Ragnaros - Guild Edition, be any proof that I earned this achievement.