One thing I found is the Activity Completion report. Course administration > Reports > Activity completion.
I turned on Activity completion within the Activity's settings so that I would get a checkmark on this report if they have submitted the activity.
However! What I really need is a hybrid of this report and the gradebook. I'd like to see a single report that shows grades and a checkmark for assignments that have been submitted and not yet graded.
A hybrid report would really show me where I stand - ex. if there are four checkmarks and three grades across my report, I'd know that that four of the seven submissions need to be graded (Activity Completion shows all submissions, Grader Report shows all grades, I need to see both in a single report).