ISSUE
Unlocked achievements have duplicate entries in the Post-Game Summary.
If you unlocked one achievement during a game session, the achievement has a duplicate entry.
If you unlocked multiple achievements during a game session, the first achievement has a duplicate entry.

Screenshot of this issue: https://imgur.com/AJTj11d

OS
Windows 10

STEPS
Unlock an achievement while playing any game.
Exit the game.
Click on the game tile in the Steam Library.
Look at the Post-Game Summary.

RESULTS
The unlocked achievement has two duplicate entries in the Post-Game Summary.

EXPECTED
Each unlocked achievement only has exactly one entry in the Post-Game Summary.