Not this again...
...couldn't people use the search function and add to the dozends of other "gimme" threads?

Achievements should never be account wide. The only thing account wide from them should be the dye unlocks, and those are. Everything else is entirely optional, and a measure of what -this particular character- has done or not done. Which shyshards -this particular character- has found or yet to find. Which crafting styles -this particular character- has learned or yet to learn. What public dungeon bosses -this particular character- has vanquished or yet to stomp. Which parts of the questing -this particular character- has done or yet to do. Et cetera.

Achievements are not a player-based gamerscore, they are character-based measure for that particular characters advancement. And there is no logical reason AT ALL for them to be account wide. Take the titles for example... if your father's brother's nephew's cousin's former roommate wins an inofficial all-tamriel fisherman competition and can proudly call himself "master angler", does that mean you can make the same claim? No, it wouldn't. So why should that alt of yours when your main makes the achievement???
As for those who may come with the "but... I as player am doing it" - whose head does the title float above, your characters, or yours as player?

Yes, some achievements are a real pain to do. Yes, the trophy ones are among them...
...used to be, if you found that polished shell on your alt, you could bank it, and take it on your main for adding to collection. ZOS changed that, to make it harder, to make your alt have to spend the time and effort hunting hundreds of mudcrabs for that shell instead. Obviously this is how they envision achievements to work - individually.