#1 - April 27, 2012, 1:27 p.m.
Account-wide achievements in their (current as per my observation) state are truly a let-down and borderline pointless. Any titles/mounts/vanity items etc don't seem to be account-wide, and the acheivement is not actually earned on other characters... it simply just "shows" that you have had it completed on another character, you don't get any other benefit from it... no points, no rewards.
Just sorta saddens me that Blizz said they had to overcome all these technical hurdles and have us wait for a long time and this is all they are providing. People are going to have to re-do achievements still anyways. The only thing that has changed is that they are highlighted instead of greyed out. Not sure what all the effort was put in for.
Anyways, if I'm mistaken on how it's supposed to work, let me know. Yes I know that pets (and possibly) mounts are supposed to be account wide. Please keep this constructive. Thanks =)