Here is the full list of all 16 There Came an Echo achievements.
Don't be a dick.
You didn't see that coming.
Complete a mission without switching weapons with any soldier.
The kid gloves are off.
Damage four enemies at once with the Charge Gun.
Always fly Burbank.
Guide Corrin out of Ignite Defense.
Sweep all twelve waves of the War Room.
She's back.
Removed from the course of things.
Save one.
Secure. Contain. Protect.
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.
Queue up and execute five simultaneous commands.