You can view the specific contact activity history for any given email address by searching for that email address or clicking on it from Reports, scrolling to the bottom of the screen, and clicking “View Event History”:
Once you click on it, the full history will display:
The Event column indicates the action that took place.
Campaign: Means that Campaign was sent to the person.
Open: The person opened the campaign.
Click: The person clicked a URL in your campaign.
Unsubscribe: The person clicked a link to Unsubscribe.
Spam Report: The person marked your email as Spam.
Bounce: The email hard or soft bounced.