I should add I'm on the latest Steam client beta and have tried various proton versions from 5.13 - current, Experimental and even GE with the same result.
I played Darksiders II back in June so it's not likely a new issue either.
Nothing extracted yet.
I have encountered an issue where some titles will "crash" steams achievement system.
Just launching an affected title is enough for the achievement section in the steam UI to disappear for every game until the steam client is restarted.
Achievements will unlock correctly for the game that caused the crash, but games started after will not unlock any achievements.
The titles I have encountered this on are:
Train Station Renovation (914010)
Darksiders II Deathinitive Edition (388410)
Exiting the steam client in this state generates a minidump assert
steamcrash.log