The Episode 3: Catch a Ride Add-on for Tales from the Borderlands has 7 achievements worth 200 gamerscore.
Completed 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