The New York Add-on for HITMAN 2 has 7 achievements worth 150 gamerscore.
Complete "Golden Handshake."
Dump the stock and take the scenic exit.
Assassinate target with the award and exit the mission via the main entrance, data core in hand.
Complete all Mission Stories in "Golden Handshake."
Complete "Golden Handshake" on Master Difficulty.
Select a Starting Location and use an Informant to smuggle an item into Milton-Fitzpatrick.
Reach New York Mastery Level 15.