All wearable devices do not connect directly with the Achievement app, the data is fetched from your fitness app and synced to your Achievement account. While we do not currently have the Activity app available to connect with Achievement, you can connect you Apple Watch to Apple Health for us to log your activities. 

To do so, please open your Apple Health app, go to sources, and ensure that your Apple Watch is one of the devices connected to your Health app. Here is a link to Apple's Support article with more information about manually syncing data and connecting.