The Hawke's Bay Add-on for HITMAN 2 has 7 achievements worth 150 gamerscore.
Complete all Nightcall Challenges.
Complete Nightcall on Master Difficulty.
Select a Starting Location and use an Agency Pickup to smuggle an item into Hawke's Bay.
Reach Hawke's Bay Mastery Level 5.
Eliminate Reynard while Orson showers, from the roof of the panic room, and with a pillow.
Trawl the beach.
Complete Nightcall.