Will I get the Program Certificate even if I scored less in some assessments?

It is possible to get the certificate even if you have scored less in some assessments. 

A course may have one or more criteria, that you need to qualify, for getting the certificate. For the criterion related to 'average score in assessments', the final score is an average of all assessments score. So if you score good in most of the assessments, and less in some, your average score may still clear the required threshold to qualify for the given criterion.