Follow these step-by-step instructions on how to track contact activity.
Click on the desired contact on the table, whose complete activity you would like to view.
Navigate to the "Activity" Tab and click on it.
You will be able to track the 360 view of activity history of the selected Contact. The information is listed in chronological order. Following are few of the many activities that is listed here - Entered Segment, Left Segment, Events triggered, Tags added, Subscription changes etc.