The Santa Fortuna Add-on for HITMAN 2 has 7 achievements worth 150 gamerscore.
Complete Three-Headed Serpent.
Feed Delgado to his hippo, crush Delgado and Martínez with the statue, push Franco off a cliff.
Explore the treasure room.
Complete all Mission Stories in Three-Headed Serpent.
Complete Three-Headed Serpent on Master Difficulty.
Select a Starting Location and use an Agency Pickup to smuggle an item into Santa Fortuna.
Reach Santa Fortuna Mastery Level 20.