The Episode 3: The Sword in the Darkness Add-on for Game of Thrones: A Telltale Games Series has 8 trophies - 7 bronze and 1 silver.
You completed Episode 3.
Completed Chapter 7 of Episode 3
Completed Chapter 6 of Episode 3
Completed Chapter 5 of Episode 3
Completed Chapter 4 of Episode 3
Completed Chapter 3 of Episode 3
Completed Chapter 2 of Episode 3
Completed Chapter 1 of Episode 3