You can only unlock a pillar badge if you rack up enough points and complete the pillar. But sometimes, if you click through the lessons too fast, the BUIDL platform may not think you had enough time to learn and process the lesson content and won't register that lesson as complete. If this happens, you can always go back to review the lesson content, and then mark the lesson as complete.
So take your time and don't rush through the lessons! It's much more rewarding to earn points when you learn something too!