Hello everyone,
We are aware of the issue with the achievements not unlocking in real-time.
We are looking into it, but for now, you can use the following workaround:
Restart the game after unlocking one/several achievements to display them.
Also, if you are struggling to unlock all the gold medals & getting all the keys, here are the walkthrough videos to help you in these tasks: Walkthrough videos
But don't forget, it's way more fun to find them yourself!