Now that all tasks are stored in Nintex Workflow Cloud, it should be easily possible to check the approval history for a workflow instance when you open the form. A "Approval history" or "Task history" component would be nice just as we have the "File upload", "Barcode", ... components in the form editor. Until we have this, we need to build a separate child workflow to save the approval history after every task action...
ADMIN RESPONSE
Sep 7, 2022
This idea is supported via the activity feed within My Nintex, either select a task or submitted from and you will be able to view the full history of approvals.