A failed update or improper installation has left the Ubisoft Connect files in a "broken" state.
Simply updating the launcher within the app might not replace the corrupted DLLs. A fresh install is often required. How To Fix Ubisoft Connect Launcher Not Working / Opening uplay-ach-earnachievement could not be located
You are using an old version of Uplay that does not support the achievement functions required by newer games. A failed update or improper installation has left
The launcher lacks the necessary permissions to access system-level libraries. How to Fix "uplay-ach-earnachievement" Not Found 1. Reinstall Ubisoft Connect (The Most Effective Fix) mistaking them for threats.
Security software may have quarantined critical DLL files like uplay_r1_loader.dll , mistaking them for threats.