Under Campaigns, you can track the sent, seen, and reply rates which get displayed adjacent to the campaign name.

Sent = Number of people who have met the conditions set by you and are successfully sent the message upon fulfilling them.
Seen = Number of people who have interacted with your message - Hovered, clicked on, and spent time on reading it.
Replied = Number of people who respond back to your message. 

You can also track which campaigns get responses based on the source, medium, and channel the visitors come from by using UTM parameters, available as a part of the the Freshsales Integration.

There are more updates to reporting on campaigns which will be out soon.