Achievements on my friend's realm are not working

I've tried to earn achievements on my friend's realm (ex. shooting a bullseye on a target or constructing a dispenser) and they seem to have stopped registering now that the world is a realm? I've viewed discussions on platforms like Reddit, and although the posts were much older, others have had the same issue. Cheats are turned off in this realm and I still haven't received credit for any achievements I've completed.