Am I able to view the history of who updated an AXUS itinerary?

There isn't a history of WHO updated an AXUS itinerary.

EDIT ITINERARY

However, in EDIT ITINERARY you can see the following in the bottom left corner of the pop up screen. You can also add advisor names in the Internal Notes field.

EDIT BOOKING

In Edit booking, you can see info in the bottom left corner.

Advisors can add a "Last Reviewed By" and "Last Reviewed By Date" in the boxes.