by Ryan Chausse.
Hi Sam,
Wanted to let you know that it appears that Moodle has included course_get_completions as a feature in Moodle 2.9. Link here:
https://tracker.moodle.org/browse/MDL-49313
Sorry, we couldn't clean our implementation up in time to send it along publicly, but hopefully this helps you out.
Cheers!
Ryan Chausse