to get 100% completion you'll need to do the following:
complete all main story missions
complete all odd jobs (paramedic missions/taxi/checkpoint races/RC races)
complete all rampages
rob all stores
collect all hidden packages
complete all unique jumps
after you do all that shit, you should be 100% complete. pretty much, just do everything there is to do. and make SURE you do all three stadium missions.
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