Frontline Veteran

Breaching Boralus - Tiragarde Sound

Isolated Victory - Vol'dun

In Every Dark Corner - Drustvar

Romp in the Swamp - Nazmir

Shores of Zuldazar - Zuldazar

Horde of Heroes - Stormsong Valley

Alliance version here: Frontline Veteran

Ok, I wanted to compile information about 5 achievements that can practically and feasibly be done simultaneously (presuming you have both an Alliance and a Horde character):

A: Frontline Warrior/H: Frontline Warrior complete all six assaults
A: Frontline Veteran/H: Frontline Veteran complete all six assaults but in Warmode (yes, you can get simultaneous credit for Frontline Warrior)
Supplied and Ready find secret chest during the invasions in Warmode

For the timer of where and when the next assaults are going to be check this site: https://wow.gameinfo.io/bfa/faction-assault-timer

This was one of my last achievements for A Farewell to Arms until I found the assaults timer.