Here is the full list of all 16 There Came an Echo achievements.
Don't be a dick.
Sweep all twelve waves of the War Room.
You didn't see that coming.
Guide Corrin out of Ignite Defense.
Always fly Burbank.
The kid gloves are off.
She's back.
Removed from the course of things.
Save one.
Secure. Contain. Protect.
Damage four enemies at once with the Charge Gun.
Never let a sniper in cover get a shot off.
Never allow the countdown to reach zero in Farrick's base.
Escape from the weapon cache with at least one turret at perfect health.
Complete a mission without switching weapons with any soldier.
Queue up and execute five simultaneous commands.