Originally Posted by
Alskonda
Titles wont be account wide, but achievements (including FoS) will. This means any achievement which rewards a title will reward the title across all toons, as long as the toon is at the required level. For example, herald of the titans. You have to be level 80 to enter Ulduar, so all your chars over 80 will get it.
Titles that wont be account wide are the ones such as the old school pvp titles, hand of a'dal etc. They give you a FoS for earning them, and you will also have this FoS over all your toons.
So in short:
If the achievement rewards a title, ALL your toons will have it, as long as they are level appropiate.
If the title rewards an achievement, all your toons will get the achievement, but not the title.