Board Thread:Support Requests - Getting Technical/@comment-5506946-20130401004831/@comment-1999071-20130401012332

Hey AstridFan, when you activate Achievements you can customize them by going to Special:AchievementsCustomize on your wiki. Remember you have to be an Administrator to customize them. There, you can add "tracks" which allows you to earn achievements when you edit pages in a particular category. Because of this, the only limit to how many badges there are is how many you make.

I'm not really tech savvy, so I can't really explain why you don't earn the achievements you earned before it was active. I'm sure it has something to do with how it keeps track of what you do. When its not active, it can't keep track.

I hope this helped. :)