Guild Wars 2

I’m wondering if someone tags along for the story they’ll unlock the achievement.
For example, a Human helping a Norn in its story, will the (guy plays as) Human get the achievements of the personal Norn story? Or doesn’t that player actually needs to make a character of each race and do the story mode?

By the way, its only till level 30 for the Achievement right?

No, the human won’t get them.

You need to get actual credit for the story, which you cannot do if you’re not a member of the same race.