we have something called 'Export All' in the tableau extension.
You can try using this extension. PDF version you can only download the entire dashboard as image and create report level pdf manually.
Here are some resources I had used to achieve the same.
You will find many links to each of the step above if you google it.
Another alternative approach to export to CSV. But that will not be proformatted.
Hope this helps. Good Luck !!