In reply to Sarah Gooding.

For plugins and themes, you just need one in the repository. You also just need a single time speaking/organizing at a WordCamp for those badges.

Last week the plugin contributors were being pulled based on who had been given commit access to the plugin's SVN repository -- i.e., the people listed on wordpress.org/plugins/[plugin-slug]/admin -- but we've since updated that to include people listed in the plugin's readme.txt Contributors tag.

For the team badges, each team will decide what qualifies as participation.