Get Introspection achievement without premium membership

Introspection 

The introspection achievement is an achievement previously thought to only be possible for premium members. But you can actually get it even if you don’t have premium! I discovered this bug while analyzing a game!

How to get the “Introspection” achievement:

1. Go to your Game Archive

2. Analyze a game

3. Click on a book move

4. Click on explorer

5. There you go! You’ve got the “Introspection” achievement