The Miami Add-on for HITMAN 2 has 7 achievements worth 150 gamerscore.
Complete The Finish Line.
Blow up Sierra Knox in her car, on the podium, and eliminate Robert Knox with his android.
Release the pink army.
Complete all Mission Stories in The Finish Line.
Complete The Finish Line on Master Difficulty.
Select a Starting Location and use an Agency Pickup to smuggle an item into Miami.
Reach Miami Mastery Level 20.