** POSSIBLE SPOILERS AHEAD **
IGN guides you to 100% sync in Sequence 08, Memory 03 of Assassin’s Creed IV: Black Flag, “Marooned.”
Mutinied and marooned with Charles Vane on a remote island, Edward must fend off Vane’s increasingly deadly attacks.
= 100% Sync Requirements =
– Skin 3 animals.
– Air-assassinate Vane.