I was able to access the Course completion page from a user's profile in 2.2.17 (via Users > [user's name] > Activity reports > Course completion; url ends in /report/completion/user.php?id=#&course=#).

However, after upgrading to 2.2.19, I can't find that link anymore. Since I still had that tab open from before the upgrade, I reopened the URL in a new tab and got strings (and a missing bread crumb) instead. Not sure if anything else changed for this install, but the link is still appearing on our other 2.2 and 2.4 instances.