Within Reports, you can see information about the titles logged in reading list challenges in overview and detailed challenge reports, along with minute logging information if minute badges are included in the reading list challenge.
To compare how many times each titles within a reading list challenge was completed, you can run the Reading List Challenge Title Completions report for your selected reading list challenge. This report can be accessed within the Participation section of your reports dashboard. It shows the number of completions for each title included in the challenge's reading list.
When using Insights to view data for a reading list challenge, you can see at-a-glance data like active readers, overall books read, top books read, and more.