The following tool is designed to connect to your Qualtrics account and export the results data for multiple surveys that you specify, in one go. The results will be appended to the Google Sheet using the survey-name to identify each sheet of data. The data itself is exported as CSV.
Source: The Gift of Script: Bulk export Qualtrics survey results
I use Google Apps Script to support staff and students in my job. I enjoy dabbling with creating tools to help with automation and I freely share my learning experiences on my blog: www.pbainbridge.co.uk