How can I view a particular contact's broadcast email activity (clicks, unsubscribes, etc)?

You can view a contact's email broadcast activity history in their individual contact record. The email broadcasts are filterable from the Activities Dropdown. 

To view how a contact engaged with a particular email broadcast, click on the email broadcast to open the record where you can view data points like the amount contributed from the email, the provider, opens and clicks on the email, open and click dates, etc.