SC2Mapster

The first campaign, Risker's Youth, takes place after Wings of Liberty.  The second Campaign, Amon's Salvation, takes place during the Legacy of The Void Epilogue Campaign.  Every other campaign continues after The second Campaign.

Here is a link a google docs about the timeline from Campaign 2: https://docs.google.com/document/d/1A-5un1_1UPu8-FNdDuuERLOBVhu-AUo2NSSqHGHymn8/edit#heading=h.4k6xd0vwerdu