Board Thread:Game Discussion/@comment-71.224.147.45-20161009160818/@comment-27673465-20161013193821

Every time you beat 1 'friend' you get one friend bonus. If you beat 10 friends in a cup you get ten friend bonus points.

I think the difference in career vs overall completion is the prior special events. I joined after many of them so technically can never get 100% completion.