The The Assignment Add-on for The Evil Within has 10 achievements.
Clear Chapter 2, "Crossing Paths."
Clear Chapter 1, "An Oath."
Lure an enemy with a phone call and lock them in a room. (Ch. 1)
Use a single trap to kill two or more enemies in The Assignment. (Ch. 2)
Survive the duel without using any electronic devices in the environment. (Ch. 2)
Get a Cadaver to grab and kill a Haunted. (Ch. 2)
Collect all Research Documents in The Assignment.
Collect all Personnel Files in The Assignment.
Complete the hidden letter in The Assignment.
Clear The Assignment in KURAYAMI Mode.