I found a few typos in the achievement system. It is something minor and not worth deploying a new version for.
Fortunately, the source code of the
achievement plugin is designed to be directly edited instead of using plugin manager. Therefore I can make a quick simple patch for it.
The patch can be downloaded
here. Just extract the zip inside the game folder and overwrite the "MUSH_AchievementSystem_P1.js" file.
That is all. Have a good day.