I can't be 100% certain that you don't have to mail any other forms. Have you followed DoninGA's advice to check the Print Center for All Worksheets to see if there are any documents to be mailed?
There are some situations where CO wants documentation for certain credits/subtractions claimed on the return, and they may have to be mailed or uploaded to the Colorado Department of Revenue.
In addition to checking the Print Center in TurboTax, if you are expecting a refund, you can check on the status of your CO refund here. That should let you know if your return has been processed or is waiting for additional documentation.
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