Hi AnneMarie

The badges would still be issued as the criteria at the time of issue were completed. 

it is possible to have an expiry date on a badge.

I think it is best to avoid having one course with different completion conditions as this will lead to inconsistent completion records. If you create a program and add the new course as being required to be completed after the first course this will result in consistent completion records and also program messages on completion of a course set can be added. There is also an ability to award badges for program completion.

Regards