Board Thread:Game Discussion/@comment-213.73.238.238-20161017135454/@comment-26819222-20161017140400

As far as I remember, it is not possible to get all badges if you haven't made all 100 % in the series. It's possible to earn "more" badges than % in the series, but not to get all of them before finishing.

Reracing same races all over again can get you 3-4 badges and it takes 2-5 rerun for each badge.