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