The The Assignment Add-on for The Evil Within has 10 achievements worth 250 gamerscore.
Use a single trap to kill two or more enemies in The Assignment. (Ch. 2)
Clear The Assignment in KURAYAMI Mode.
Complete the hidden letter in The Assignment.
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.
Survive the duel without using any electronic devices in the environment. (Ch. 2)
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)