It happens for various reasons, you’re 94% complete with one of the transportation awards like say “Rock Solid” for ORE. Just transport a bunch and check the award and it’s still at 94%. Hey, what the! Yup but we have a way to fix that.
1. Go to the Main Menu and tap “Options”
2. Now select “Reset/Sync”
3. Choose “ReSync Game Center”
4. Just confirm this is what you want to do. <- make sure you have a good Internet connection
5. Dismiss the alert and you may see award banner notifications for any awards you had completed but not earned.