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