Complete the following tasks to unlock PlayStation 4 trophy rewards.

Trophy	How to unlock
All Aboard! (Bronze)	Board a ship without losing any crew members.
Firepower (Bronze)	Kill five guards at once with a blunderbuss.
His Full Attention (Gold)	Achieve 100% synchronization
His Own Medicine (Bronze)	Disarm the Gouverneur and kill him with the branding iron.
His Word Was "Perhaps" (Silver)	Complete all missions.
Killer Killer (Bronze)	Harpoon a killer whale.
Liberation Day (Bronze)	Free your first slave.
Mer-man (Bronze)	Swim a total of one nmi.
Seeds of independence (Silver)	Liberate 500 slaves.
Silence, Fool! (Bronze)	Kill a guard ringing a bell.
Thug Life (Bronze)	Plunder thirty ships.