Guild Wars 2

Question: Can you earn any of the mastery points more than once using an alt? For example for map completion?

Masteries are account-wide but some of the things you do to earn the points are per toon.

No, you can’t. I think most of them are related to some achievements, wich also only can be earned once.

Basically in the end, to get all masteries, every person has to do the same: get all the mastery points by doing specific (same for every player) things (this is an account ‘quest’, not per character), and farm the experience (also account progress, not character).