The process for enabling Completion Conditions in large courses is very tedious. This is because the teacher must configure the settings for each and activity separately. Moreover, to use the "require grade" (what grade?) condition in a meaningful way, the teacher must also set the "grade to pass" value for each activity via the gradebook interface (yet another separate interface). All of this can be streamlined by creating a single interface to control all these settings, as described here:

http://moodle.org/mod/forum/discuss.php?d=187867#p820169