Can goals be archived?

Goals cannot be archived in Namely - however, you can filter them by a specific tag. You could tag the goals you'd effectively want archived by tagging them as such to easily identify archived goals, but they would still remain visible.

Another option is to update the goal status to 
Draft, and then ensure that the Access Roles for your employees are unable to view goals that are in draft status. Employee access roles generally do not have visibility into draft goals by default, but you can review your settings 

For more information on updating tags and goals, review 
Creating Goals in Namely.