The A Matter of Family Add-on for Batman: Arkham Knight has 8 achievements.
Defeat 15 enemies using any type of hacking.
Uncover the secret history of the park.
Rescue your father.
Free the hostages at the Ghost Ship.
Destroy all Teeth, Balloons and Jack-In-The-Boxes.
Free the hostages at the Merry-go-round.
Free the hostages at the Ferris Wheel.
Defeat 4 enemies within the duration of a single scare effect.