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Within FileMaker the thing you are looking for is called a Pop Over. A "Pop Up" is a different kind of thing.
You will need at least FM13 to use Popovers. Use the edit menu, Insert>Pop Over Button, to insert the button.
Yo can then add a Portal inside the PopOver showing your list of overdue assignments. You can have a second one that will show upcoming assignments for the next few days as well. Or put them in the same screen.
As for additional features, you might consider a way to record the grading or score given to each assignment and possibly a running total % score for all assignments to date.
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