Here is the full list of all 40 Pirate Code achievements.
Completed Chapter 1
Completed Chapter 2
Completed Chapter 3
Completed Chapter 4
Completed Chapter 5
Caught every Sea Creature
Harvested every type of Vegetation
Collected every piece of Pirate Gear
Collected every Clockwork Gizmo
Collected every Molo Artifact
Collected every Zen Relic
Collected every Dark Echo
Collected every Royal Article
Completed every Mission
Discovered Ship Designs for every ship
Completed every Challenge of the Humble
Completed every Challenge of the Hero
Completed every Challenge of the Fearless
Completed every Fishing Challenge
Completed every Botany Challenge
Unlocked every island on the map
Built an Ogre
Build a Clockwork Turtle
Built a Cargo Fin
Built a Dragon
Sunk 500 enemy ships
Sunk 2,000 enemy ships
Collected 7,777 Gold
Recruited every possible Crew Member
Fully liberated every island
Collected every Fleet Color
Collected every Flag Pattern
Collected every Flag Emblem
Completed the tutorial
Gathered supplies from Snake's Den
Hired a crew member
Purchased a ship
Caught a Sea Creature
Unlocked a ship upgrade
Completed a challenge