how do I generate a list of students who did (or did not do) assigned peer reviews?
Are you talking about a Peer Review Assignment or a Peer Review Discussion?
If you are referring to a Peer Review Assignment - How do I use peer review assignments in a course?
Specifically, from the section on View Peer Review Grades:
The Peer Review page for the assignment will show the names of students who have completed the peer review.
Likewise, if you are mean a Peer Review Discussion - How do I use peer review discussions in a course?
In both cases, you have to go into the Peer Review page to see who is assigned which peers to review.
From the assignment page itself, you have a new item to select.. Peer Reviews:
From How do I manually assign peer reviews for an assignment? Here is an image of List of Peer Reviews.
Assigned peer reviews appear underneath the student names. A check mark  indicates a peer review as been completed. A warning icon  indicates a peer review still needs to be completed.
Hope these resources help,Cheers - Shar
I just wanted to know if there's a quick table I can pull up showing who posted the two required peer reviews.
I figured out the long way to do this-- I just pulled up peer reviews for each assignment and manually counted who didn't have the check mark.
Retrieving data ...