This is weird. I just received a few random achievements on my computer, and I wasn't doing anything to earn them. I was playing my PS4 at the time, and they popped out of nowhere. Every time I clicked on them to see which game they were coming from, Project Spark kept showing up on the Xbox app like they were earned from that game. I could see the percentage kept increasing, and so was my gamerscore. I wasn't playing the game, in fact I haven't played the game recently.

I went on to my Xbox One. I went to my achievements, and they didn't update with those achievements earned. On the Xbox app, it doesn't say that they've been earned, nor does it say my last game I played was Project Spark.