If Feat's of Strength count (because alot of them used to be achievements too) I would say the lvl 60 Onyxia achieve. Just a bit a proof you've been around awhile.
I'd have to say Master of Arms simply because of the amount of time it took me to get the last points for them on my mage.
Definitely my Hand of A'dal title. I worked hard for my BT attunement.
My favorite achievement is Veteran of the Wrathgate because the quest line is great and you get to see The lich King losing for a moment
I'm most proud of my Loremaster achievement because it was a personal endeavor that took quite a while to complete, especially the Kalimdor and Eastern Kingdom quests before you could fly in those areas. It also enhanced the game for me because lore is the backbone of WoW, and everyone loves a good story. :)
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My favorite was "The Justicar." I initially in getting it wasn't really that trilled, because I was going for Battlemaster anyway. I wanted battlemaster more than anything, really. It came down to 2 achievements, "Had It All Along*cough*" and "resilient victory". As it turns out, I had already capped WSG rep as well. So, farming it out, I hit League of Arathor before I hit either of those 2 achievements. Wearing the title, trying to get Battlemaster, it grew on me. It grew on me so much, I abandoned my Battlemaster quest.That said, I'm really looking forward to "Warbound".
Loremaster of Kalimdor, back before patch 4.0x made it a ton easier.
They Love Me In That TunnelIt's true, they really do.
It's gotta be getting Bane of the Fallen King back when it meant something.
I love doing the achievements! The one that I am most proud of is getting The Loremaster. What a long strange trip it’s been, comes in a close second. I love the color purple and finally getting the violet proto drake felt awesome!
For me my "Favorite" Achievement was Looking for Multitudes getting that ment that I never had to que with terrible random players that couldn't move and think at the same time.
For whatever reason, ever since I got Ambassador title, I've always worn it. Over LoD and KS, even. I guess it's just not worn much on my realm, so I feel pretty unique. However, whenever I get Professor, It miiiight change. ;)
Exalted with the Zandalari has its benefits. They said they'd let me be a boss in ZG or ZA if they ever get a space open...
Like the last one, getting an achievment from the current raid tier feels great, that was the feeling when i got Twilight Vanquisher, both on 10man and 25man of t7 raid content.
Champion of the Frozen Wastes - or in particular The Spellweaver's Downfall. My guild had worked really hard to down Malygos before I took a break from WoW at the birth of my kid. We got so close the last night I played, but it didn't happen. After my return some months later we went back and 1 shot it. It felt good to finish that tier of raiding (my first and last I've completed) and doing it with a bunch of awesome people.
Scourer of the Eternal SandsBecause my guild is named "Behind my Camel" and the title "the Camel-Hoarder" goes so well with it.
Feat of Strength achieve - Tabard of the Argent Dawn. I only have it on my paladin, but it's the best looking tabard in my opinion. I wish they'd bring it back. Oh well, the achieve is a feat of strength, due to it only being available during the Undead Invasions prior to the launch of Wrath of the Lich King (and another time I think, back when Naxx was first released in Vanilla).
I am definitely most proud of my Exalted Argent Champion of the Horde achievement.Since I started playing in the beginning of Wrath of the Lich King, I was very intrigued by this set of dailies. Starting out as a mere valiant, I worked my way up to champion the cause of one of my beloved Horde factions. Being undead, I naturally started at Undercity. Every day after that, I would come to the tournament and work hard learning the ways of the champion and what the tournament had to offer. Little did I know that once I became a champion with undercity, I would be allowed to become a champion with every one of the other horde races. Filled with excitement I pushed on until I championed every one of my glorious Horde factions. Once I had finished with the Argent Crusade, I was so happy to finally have finished this long journey.I wore my title "Crusader" with pride, knowing that not many people on my server had this glorious achievement. I actually had a lot of people message me where I got the title from. I still feel great about earning that achievement, it was a long journey filled with a lot of hard work.