It's telemetry, and achievements have been used that way pretty much as long as they've been a thing. See Dan Teasdale's 2009 "Design Lessons Learned from Rock Band" https://vimeo.com/7087821 The relevant part starts at 32:35.
It would surprise me a little, though, if someone retroactively adding an achievement to an old console game is doing it for telemetry purposes.
My original comment was based on reports from some indie game authors talking about their development experiences, and going "ugh, I have to add achievements, fine".