There are 30 Collectibles in the “A Matter of Family” DLC of Batman Arkham Knight (15 Joker Teeth, 10 Balloons, 5 Jack-in-The-Boxes). Finding all of them unlocks the “A Blade of Memory” trophy / achievement.
They are not marked on the map. The best way to find them is to use detective vision. You can still collect all of them after finishing the DLC story (there’s free roam after the story, nothing is missable). If you want you can also collect them right in the beginning, they are all in the outside area (there aren’t any in story buildings). Use the Batarang to destroy Joker Teeth and Balloons. Jack-in-The-Boxes can be activated when standing near them.
JOKER TEETH
BALLOONS
JACK-IN-THE-BOXES
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