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I like Insane in the Membrane, because I needed a year to get it.
For me it was surely the Insane in the Membrane due to how long it took me to get it, specially for having a great but time consuming job wich leaves me almost no free days...But at long last, even if it was after Cataclysm came, I got my Insanity proof (but for some guys out there getting it post Cata is like less Insane, but thats just crap, and I have done the full Shen'Dralar grind to exalted so I know what I'm talking about...damn these elves, really ^^').PD: My great job is in an Outdoor Adventure park in Spain, so weekend/holidays is when we have the most work, and for like 8 months its almost non-stop, it's really crazy most of the time but it feels really great ^^.
There is just to many awesome achievements. The Leeroy jenkins one with all the whelps. The now FoS maxed unarmed combat or the great PvP titles (which I always use). My favorite would have to be the achievement for the completing the epic flight form for druids. Swift Flight Form
Insane in the Membrane is mine. I'm really insane, because i've spent all the money i had (and the guild's gold too) on Decks, which was over 60k gold.
Mountain o' Mounts.There is nothing I enjoy in WoW more than collecting mounts! I try my hardest to grab each in-game one (those fancy-pantsy TCG ones don't count!) as soon as it comes out. And when I finally got this achievement and earned my beautiful Blue Dragonhawk, I knew my journey was over... Until Cataclysm was released of course. ;)
I'd have to go with One Light in the Darkness (25 player), it's just a really cool name, and makes my imagination run wild.
Of course the Brutally dedicated!:D
most proud of Firefighter, we only got it after TOC was out but we still busted our balls for it
For me it is with out a doubt Insane in the Membrane . I farmed for that title for so long XD the first rep I got was the shen'dralar ><.
For me it has got to be Stood in the Fire I got this Achievement while in Ramkahen. I was afk at the time and came back to a dead body, After checking my chat log i was quite honored and upset that Deathwing came all the way to Uldum just to kill me! :)
I'm most proud of my Grand Marshal. I got it during the "old" days of the GM grind. :) It's something I don't think I could ever do again even if that system still existed.