For more information, see the [badges] wiki on Meta Stack Exchange.

But note that Stack Apps is a little different from other Stack Exchange sites. See:

1. Does Stack Apps have some special rep and Community Wiki modifications?
2. The [meta] tag wiki

Hence the badges here are not fully consistent with other sites. For example:

1. Stack Apps doesn't have the Beta badge but it does have the API Beta and API Evangelist badges.
2. Stack Apps currently doesn't have the Informed badge.