The The Knife of Dunwall Add-on for Dishonored has 10 achievements worth 220 gamerscore.
Attach an arc mine to a rat, resulting in a kill
Complete The Knife of Dunwall in High Chaos
Perform a drop assassination from atop the Empress statue in The Knife of Dunwall
Complete The Knife of Dunwall in Low Chaos
Complete The Knife of Dunwall without alerting anyone
Complete The Knife of Dunwall without killing anyone
Speak with the statue of Delilah Copperspoon in Timsh's estate
Meet with Thalia Timsh, the Barrister's Niece
Purchase all of the Favors in The Knife of Dunwall
Get the information you need from the Rothwild Slaughterhouse