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