Workflow State Actions - Require assignments to be completed

I have a workflow created where the State of each workflow has a few Assignments to be completed. Is there a way to restrict the ability to manually transition the object to the next State in the workflow until all Assignments in that State are completed? I do not want to automate the transition. I would still like it to be manual. So I do not think that I can use the Trigger tab.

Any suggestions?

My example: a Contract object is created and goes through several State transitions until it is awarded. Each State is set up with Assignments that are essentially questions to answer about the vendor. We put this data gathering into an Assignment. I would still like the manager to manually transition the Contract object to the next step in the workflow, but want to restrict that transition until all Assignments in that State have been marked as complete.

  

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