The Summer Bonus Episode Add-on for HITMAN has 10 achievements worth 160 gamerscore.
Complete Landslide.
Complete Suit Only and Silent Assassin Challenges on The Icon, A House Built on Sand or Landslide.
Complete The Icon.
Assassinate Bosco with the monster teeth, in a pyrotechnics explosion, and in a fire.
Complete all Opportunities in The Icon.
Complete A House Built on Sand.
Eliminate Mendola with the crystal ball, Kong in an electrocution, and both by poisoning the pipe.
Complete all Opportunities in A House Built on Sand.
Eliminate Abiatti by impalement, pen and fireworks explosion.
Complete all Opportunities in Landslide.