We need to pay attention to what we celebrate. We must first decide what we want our outcomes to be. For example, I have a goal to read 100 books that will help me be a better leader. The outcome I want is to be a better leader. The 100 books is just a means. If I only celebrate completing the 100 books I miss entirely whether I am a better leader or not.
The outcome for students we desire is to be better learners and better people. If we only measure and celebrate when students complete classroom and/or homework assignments, we may miss whether they are learning or not. The assignments may help achieve the ultimate goal but it's important to never take the focus off the ultimate goal.