Here is the full list of all 18 Choice of the Pirate achievements.
Acquire three ships to launch your fleet.
Steal from the Pirate King! You've got guts, Captain.
Defeat the ghost ship.
Become a spy for the Crown.
Acquire two ships to launch your fleet.
Remove the threat of Blackguard from your future.
Defeat the Lusca.
Rescue a mermaid.
Fall under the curse of the ghost ship. Congratulations on your zombification!
Earn the notice of El Sabio.
Capture your first target without sinking it.
Convince Evan Lark to open up to you.
Acquire one ship to launch your fleet.
Save Jim the Cabin Boy from an untimely death.
Turn over your first bounty to the Crown.
Steer the Crown in the wrong direction.
Will those mutineers get what's coming to them?
Become the Pirate King.