The Episode 6: The Ice Dragon Add-on for Game of Thrones: A Telltale Games Series has 8 achievements worth 160 gamerscore.
Complete Episode 6.
Complete Chapter 7 of Episode 6
Completed Chapter 6 of Episode 6
Complete Chapter 5 of Episode 6
Complete Chapter 4 of Episode 6
Complete Chapter 3 of Episode 6
Complete Chapter 2 of Episode 6
Complete Chapter 1 of Episode 6