I had an idea during the last contest…COMPETITON: Design A Generation Zero "Dalahäst" - Winning Submission to be Added to the Game! I knew the submission wasn’t good enough win the contest but I still think the idea behind it was good so I will submit it here for your feedback.
They should have missions or objectives connected to collectibles. My submission was a Dalahäst with a map on it but they don’t have to be so obvious. They don’t even need to be official missions that show up in your log. They could just have hints, riddles or something in their description that lead you to do, find or just see something.