from what ive seen so far in game aswell as on fora, is that most people tend to think this achievement system awesome (as if they forget that blizzard just didnt have enough content and this is just there to fill in the time)
people talk in guildchat or whispers to me all the time: !! look i got this achievement or hey look what i did..
is there anyone else out there who like me really doesnt care about the achievments?? yes yes i know blizzard will give some wellfare epics in the future for points but so what? i mean you raid you get loot thats te point off the game, to never have the best possible gear yet to try to gain it nontheless.
stories and such is a nice timefiller but no more than that, eventually it comes down to what gear you have, gear is and will always be the movement factor in world off warcraft (whether you agree or not is not important) this is for the majority off people that play WoW true.
thus.. achievements are useless, the only thing you can do is show off, and tbh no one in his right mind will ask if you have done a certain achievement when pugging a heroic for example, they will just ask what your gear stats are like and eithre take you or not.. whether or not you killed some dragon with 2 or 3 baby dragons attached to it doesnt matter..