I wish there was a card that summarized the awards and milestones. Keeping the cover sheet is a very minor inconvenience. Maybe a later expansion might contain such a thing?
Why not staple it with the rules? additionally, you have probably learned the new milestones and awards after a few games.
Imagine the staples rubbing against the board during storage/transport!
I probably will remember them, but if the board isn't played in a while then the brain cells may fail.