User blog comment:Youra/badges/@comment-10688548-20130517201917

The founder of a wiki has "administrator" and "bureaucrat" rights, and these are what gives the user his rights and powers. Any other user given administrator and bureaucrat rights has as many rights as the founder: "founder" itself is merely a sticker on a profile page.

If you are an administrator of the wiki, then you can create and modify badges at Special:AchievementsCustomize on your wiki, regardless of not being the founder.