Very old games on Google Play tend to get removed from the store at some point, but often you can still download an APK from APK mirrors and install the game, and achievements will still unlock. There were some games I'd encountered that don't even connect to Google Play anymore, but more often than not you can still unlock achievements even if the game isn't on the official store anymore.
I haven't played this game in particular, but it seems high quality, so maybe you could still unlock achievements in it.
P.S.: use APK mirrors at your own risk, as it is very easy to catch malware by downloading APKs from untrusted sources.