Here is the full list of all 17 Buccaneers! achievements.
Conquer the Caribbean for France.
Complete Act 3.
Acquire a Three-Decker.
Complete Act 2.
Have a full fleet of four ships (excluding temporary ships).
Fully upgrade a ship.
Reach player level 20.
Rename a ship.
Steal a ship from an enemy harbour.
Complete Act1.
Have a fleet of two or more ships (excluding temporary ships).
Choose which faction to join.
Capture any town by defeating its fort.
Capture a ship.
Conquer the Caribbean for Britain.
Conquer the Caribbean for Spain.
Conquer the Caribbean for the Buccaneers' League.