Make sure you sign in with the same Apple Account (Apple ID) that you previously used with the Apple Health app and Apple Fitness+. Your Health and Fitness data, including your awards, achievements, activity history, and accumulated progress, are associated with that Apple Account.
Using a different Apple Account may prevent your previously earned awards and achievements from appearing. Once you sign in with the original Apple Account and your Health data has been restored or synced through iCloud, your previously earned awards should become available again.
If the awards still do not appear, you can also try unpairing and then re-pairing the Apple Watch that originally earned those awards. After pairing it again with the same iPhone and Apple Account, allow some time for the Health and Fitness data to sync. This can help re-establish the connection between the Apple Watch, your Health data, and your previously earned Fitness awards.