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