Board Thread:Support Requests - Getting Started/@comment-31312171-20160610215346/@comment-25024589-20160610223015

Assuming you have enabled them through Special:WikiFeatures on your wiki, go to Special:AchievementsCustomize (also on your wiki). From there, you can change the names and pictures of the badges and also add new category-edit tracks.

You can also refer to Help:Achievements.