Welcome to the DocuSign Support Community!
Currently, there isn't a way to bulk download the signed documents in standard DocuSign.
Each completed document would have to be accessed and downloaded individually.
However, there are a number of advanced options for extracting documents and data from DocuSign. These range from
I would recommend for you to reach out to your Account Manager, to see which option works best for you and your use case.
DonnaDocuSign Support Community Moderator