How to "fix" the Error in AchievementsDownload.cpp crash.

[Avistal]

The crash caused by the Error in AchievementsDownload.cpp - Unknown file extension for achievement is from the Community Challenge not being recognized as a type of achievement. As long as the reward is still available every time the list is checked a crash to desktop occurs.

Solution / Workaround : Go claim all the challenge "rewards" on the Assassin's Creed Valhalla page of Ubisoft Connect and it should stop this specific crash from occurring. At least until the next completed challenge...

Hope this helps someone else get back to playing.