Hi
If you met the requirements for an Activity Challenge but the achievement has not yet been awarded, then Apple advises that you should wait for up to nine days for it to be awarded:
Earn Activity achievements using your Apple Watch - Apple Support
If the issue persists, then I suggest that you contact Apple Support for assistance:
- Contact - Official Apple Support
- Apple Support (@AppleSupport) | Twitter
- Genius Bar Reservation and Apple Support Options - Apple
The following steps may also help:
If you have not yet done so, update your iPhone and Apple Watch to the latest compatible software versions, starting with your iPhone:
- Update the iOS on your iPhone, iPad, or iPod touch - Apple Support
- Update your Apple Watch - Apple Support
Check your personal information:
- On your iPhone, in the Watch app, go to: My Watch (tab) > Health.
- If the setting for Wheelchair currently states "Not Set", then change it to "No" and then restart both your iPhone and your Apple Watch, turning both off together, then restarting your iPhone first: