So I got a bug, I've had this "achievement" notification up on my screen for like 30 minutes now
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I've seen a few other reports about this by now, and as was mentioned a few posts ago, I think it's a Ren'py bug. The achievement system I'm using wasn't actually developed by me, but there is no obvious reason why it should behave like this unless the game engine itself is bugged.
Anyone running into this bug
should not save their game, despite what was said by someone else earlier. You need to revert to before the bug happened, either by using rollback or by loading a save. If you save, the popup will be there "forever."
I'm looking into creating a "failsafe" for this bug in an upcoming 1.0.1 update where I will try to get rid of any stray popups between actions. I'm waiting for a while before making such an update, however, so that I can get as many fixes into that update as possible and not have to make another one after that.