Not all titles:
- I'm ok with Master Angler, Enemy of Coldharbour, Daedric Lord Slayer, Monster Hunter, Holiday titles etc becoming account wide since they're nothing but a grind
- But I'm not okay with Stormproof, Flawless, Ophidian Overlord and the other Trial Titles becoming account wide since they're signifying your skill with the class/build that char has
Most definitely not.
Achievements should mark some kind of accomplishment for that particular character. Making them Character-wide demeans their value and sense of accomplishment.
Character-wide Achievements would be the equivalent of letting every member of a family call themselves Olimpic Gold Medalists, when in fact only one of that particular family won the award.