Following feedback, we have now reduced the 100% completion to 80%.
This enables players to still receive all the rewards even if you don’t want to go online (Rivals and Online Adventure) alongside if a player misses a few dailies, there is still a chance for the rewards.
If you got over 80% in Summer) - You will still receive the Porsche.
The update will roll out later today.
You can see the release notes stating this here.