I really like this idea! I think it could serve as a really powerful motivator, and keep you energized to learn. Just seeing how far you’ve come, and all you’ve completed.
Furthermore, I think it would be awesome to use this “timeline” as a monthly or yearly recap. Something akin to the Spotify thing that everyone has been raving about.
And I also really like the idea of being able to add these skills and courses to LinkedIn, similar to what you can do with language proficiency in Duo lingo.