The achievement I am most proud of is most likely Kel'Thuzad's Defeat (10 player) because killing Kel'Thuzad was probably the first time our guild cleared current content up to the final boss. It was sort of mindboggling at the time, because back in BC we were stuck on Shade of Aran in Kara for god knows how long, in fact it took us until the patch before the WotLK X-Pac for us to down him and the rest of Kara. And to go from that to clearing a rather difficult fight at the time, in my opinion, was just an outstanding feat. Not to mention that it was all guildies, and not pugged players which made it extra special!
The First Rule of Ring of Blood is You Don't Talk About Ring of Bloodjust look at the name.
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Definitional Grand Marshal, Longest, hardest work I have ever done...
Did Somebody Order a Knuckle Sandwich?, just because it was really anoying to get.
My favorite achievement is The Justicar. I got mine back in vanilla when resilience wasn't implemented yet. I never had so much fun in battlegrounds on my warrior. Smashing people with a huge sword and almost one shotting them. Good times! I never stopped using the title gained by this achievement because of that.
For me it would be: Shave and a Haircut.Seriously, you have to be a real man to walk into a barber shop and ask for a pink/purple ponytail haircut. Specially if you are an orc. Like me.:(
I really like the Collector's Edition: Frost Wyrm Whelp cause all my alts get 2 achievements instantly upon creation. Makes me smile each time.
Looking For Many , because You get the title ˝the Patient˝ and many players would need that in real world. Not just QQ and leave.
Definitely completing What a Long Strange Trip It's Been, mainly for the Grateful Dead reference...
It'd have to be The Frozen Throne. It might not seem like much to most people, but for my casual little 10 man guild that barely survived struggling through Wrath of the Lich King, it was a great night and we showed our kingslayer titles with pride. It was like we'd made it.
Totally has to be getting Mr. Pinchy's Magical Crawdad Box from Mr Pinchy. I spent days flying around Outlands fishing for him. Then getting him, and waiting another 2 days to use the wishes to try to get this pet to drop. The very first grindy achievement I ever earned.
frost bitten!took a long while to find all the rares for this achievement but it was well worth it!i saw so much of a lot of northrend it was like a virtual holiday, i knew exactly where they would spawn!just a shame the time lost drake still continues to elude me :(
I would have to say my Karazhan achieve. The reason being that when I got that achievement I was already lvl 80 at the time but I went with my son, a lvl 70 mage, and my nephew, a lvl 70 shaman, we were just messing around and seeing how many times we could get my nephew's character killed. To our surprise we ended up completing the instance with many deaths to all us all and large repair bills. But we had a blast, laughed and carried on the whole time. We still talk about even today.
My most proud achievement was the undying..After being in naxx for all of two hours my guild and I realized that no one had died...This was strange to use because well we were dying all the time in there this was before they came out with the gear from TOC and Ulduar. And the last fight we were on was Kel..well sure enough end of the story is we killed the last boss and got the undying. We were one of the few guilds that got it before it was easy to get, But that is my proudest.
Accomplished Angler of course
Exalted with Zalandar from just old school 10 man runs back at 60.
I think that the most world events like Pilgrim's Bounty and Hallow's End has the funniest achievement names at least. Like Bring Me The Head of... Oh Wait and G.N.E.R.D. Rage for Hallow's End. For Pilgrim's Bounty the funniest ones in my opinion are The Turkinator and http://www.wowhead.com/achievement=3579. These are my favourite achievements and the humorous of those names are so nice that I consider those as my favourite.
Leeeeeeeeeeroy! obviously, what else?