Hi everyone, thank you for posting about this issue, I can confirm we are still investigating an issue with degradation on the server that could be causing synchronization issues with achievements and also connectivity. We are monitoring the situation and will update you when we can confirm this is fully resolved, thank you for your patience.
Please check our support banner for any further updates - https://support.ubisoft.com/en-GB/News/000097118/
Please check our support banner for any further updates - https://support.ubisoft.com/en-GB/News/000097118/