Another method involves replacing local achievement data files to trigger unlocks: Steam Community Navigate to:
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Rename the original files to something like UbiOverlay.dll so they aren't overwritten but remain available if you need to revert. uplay ach earn achievement download upd
The "ach earn" process is trying to display a notification, but another overlay (like Steam or Discord) is blocking it. uplay ach earn achievement download upd
If you search frequently, you may eventually need to reinstall the client.
