phpDoc
Available at http://phpdoc.achievementsapp.com/.
Database model
As of versions 2.0.x, Achievements has three custom database tables: achievements, achievements_actions and achievements_unlocked. For the 2.1 release, it is planned that Achievements will switch to using custom post types. I currently intend that we’ll only need one extra table when that happens. More information on the 2.0.x database model.
Add support for 3rd party plugins
Learn how to add support for a plugin to Achievements (non-custom post type version).