The Episode 2: Starved For Help Add-on for The Walking Dead (Xbox 360) has 8 achievements worth 100 gamerscore.
Complete chapter 1 of episode 2.
Complete chapter 2 of episode 2.
Complete chapter 3 of episode 2.
Complete chapter 4 of episode 2.
Complete chapter 5 of episode 2.
Complete chapter 6 of episode 2.
Complete chapter 7 of episode 2.
Complete Episode 2: "Starved For Help"