My feeling is that generally, all the Qualtrics related stuff is accessibility compliant, however, I would ask you to confirm with support. That leaves the questions and answer choices.
I haven't done this before, however, here's how I would try to go about it:

1. Extract survey definitions using API (these will be in a JSON format)


2. Extract HTML of questions and choices from the JSON


3. Test each of these using some accessibility library.

There are multiple question types that are not accessible. For the latest updates see:
https://www.qualtrics.com/support/survey-platform/survey-module/survey-tools/check-survey-accessibility/#QuestionTypeAccessibility
Qualtrics recommends using simple layout as the theme layout for accessibility
https://www.qualtrics.com/support/survey-platform/survey-module/survey-tools/check-survey-accessibility/#AccessibleThemes
Here's the current list of features that are not compatible with basic layout. Qualtrics is redesigning the platform so that some of these features will eventually be available in simple layout
https://www.qualtrics.com/support/survey-platform/survey-module/look-feel/simple-layout/#CurrentlyUnsupported
Has anyone used API queries to determine the survey question types used for a given survey, associate them with a user, and aggregate the output across users in a brand?
Thanks,
Sergio