Definitely Veteran of the Shifting SandsCosted me some cash, but I got tons of lore and awesome quests in return.
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My favorite is The Plagueworks (10 player) because it was my guild's first time downing Putricide, on only my second time raiding with them. I'm not much of a raider but it felt good to help
Did Somebody Order a Knuckle Sandwich? Obviously . . .
Glory of the Icecrown Raider (10 player) because while getting it I found my love for tanking, met some really awesome people, and I was able to do it while it was current, which makes me quite proud of myself :)
Insane in the membrane and also loremaster before cata came out.
I'm most proud of completing . I completed all of the old world zones pre-Cataclysm, along with all of Northrend and almost all of Outlands. I lost track of how many times I went from Gadgetzan to Ratchet to Booty Bay and back! I was 100 quests shy of finishing Netherstorm to finish off Outlands when Cataclysm launched and the requirements changed. Being a lore junkie anyways, I completed all of the Cataclysm zones as well as Netherstorm to earn the title. Out of my 30-odd titles, it's my favorite. I love playing just to see the storylines unfold, to go places and see new things. Next on my list? To go back and do all the quests in the newly redone old world. :-)
My favorite achievement thus far is the Feat of Strength "Swift Zulian Tiger." I had won it earlier in the day and it was all I could do not to actually use the item. I saved it until later that night, and when my guild and I were inside of Naxxramas for our guild run, I typed out "OMG, WTF kinda loot is this?" On vent, people were asking what I was talking about. That's when I finally used the mount item in my bags and earned the achievement "Swift Zulian Tiger." People were going crazy on vent ... well, at least for 10 seconds until somebody pointed out I obviously didn't loot it, or it would have been displayed in chat. Still, good times ... good times. =)All in all, it's really about the fun I had and the anticipation leading up to the night, and in the end I had myself a mount that I had always wanted since my toons were level 60 back in the day before any expansions. As a Horde, I envied the Alliance and the ability to get a tiger mount (my favorite in the game), and now I had one myself. Yay me!
The achievement I am most proud of is Iron Chef. I've been playing World of Warcraft for about five years now and I'm glad that I got all the cooking recipe that is unavailable now or it would of been impossible to get this achievement. This has got to be my favorite achievement also because its my favorite show too.
DEFENDER OF A SHATTERED WORLD!Seriously, getting this achievement right when my guild downed Nefarian was awesome (especially because I was one of the people who got the title, unlike a few others who were missing some content).While it's rather new, it's still an awesome achievement with an equally awesome title attached.
I am most proud of my Glory of the Raider (25man). We were the first and only guild on my server to complete the meta when it was current content and receive the Black Proto-Drakes. The night we went for The Immortal was probably the most nerve wracking night of raiding I've ever had, especially when one of our add tanks got ice blocked on KT right as adds were coming out. But everyone was definitely super excited as soon as the boss died and we got our achievements!
Overall I would have to say I was proudest of our first (original) Ragnaros kill. There have been many since but none like this. We were a group of 5 smaller guilds, unwilling to become one, that came together on raid nights to conquer bosses for sexy loot! Getting so many different leaders to play well together for so long was quite the fete! Since then, I would the first defeat of Sunwell. Other than being blinded the first time it was quite satisfying.
My favourite would have to be the Knight-Lieutenant title, awarded by a feat of strength, back when 2.0 was up. Well, we didn't have achievements at that time, but we had titles.Anywho, this is my favourite one for two reasons:1. You can't get this one anymore, which makes it worth something, and it shows i'm old school!2. I don't have any other "Valuable" achievement, so i can only brag with what i have :P