Have you been searching for a single report to show all the historical activity of an individual user?
Although Salesforce (the platform that AIM is built on) does not have functionality to create this single report, it can create one-off reports showing an object and its field history. These reports are generated on an object by object basis, and will include data on only those fields that have history tracking.
A second option is to run a setup audit trail report. Learn more about which specific information is tracked in this Salesforce article: "Monitor Setup Changes"