The Episode 3: Catch a Ride Add-on for Tales from the Borderlands (Xbox 360) has 7 achievements worth 200 gamerscore.
Complete Episode 3
Complete Chapter 6 of Episode 3
Complete Chapter 5 of Episode 3
Complete Chapter 4 of Episode 3
Complete Chapter 3 of Episode 3
Complete Chapter 2 of Episode 3
Complete Chapter 1 of Episode 3