All activities synced from your tracker appear on your profile page on the "I Did This" tab.
To access your profile page on grokker.com, click on your profile icon in the top right corner and select "My Profile". Then click on the "I Did This" tab to find your synced activities.
To access your profile page on the Grokker app, click the profile icon at the bottom of the screen and select the "I Did This" tab to find all your synced activities.