Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.

Achievement	How to unlock
Anchor of Trepidation	Complete all missions in the Isles of the Dead.
Arrow of the Loyalist	Play every multiplayer map for one faction.
Articles of the Braggart	Complete 5 Co-op Campaigns.
Barnacle of Cannonball Attraction	Get sunk 10 times in a multiplayer game.
Binnacle of Bounty	Return an enemy treasure boat to port.
Catch of the Day	Pick up a merchant cargo.
Certificate of Plank Walking	Achieve mutinous morale.
Chest of Riches	Reach 10000 gold.
Cringle of Responsibility	Buy a new ship.
Crown of Terror	Gain 1000 points in a multiplayer game.
Cutlass of Fear	Gain 500 points in a multiplayer game.
Eyepatch of Identification	Sink a friendly ship in a multiplayer game.
Flotsam of the Foresaken	Sink 10 ships in a single level.
Goblet of Congeniality	Host 10 multiplayer games.
Hammer of Relocation	Complete the georgetown campaign.
Hammock of Inconsideration	Discover the Isles of the Dead.
Hand of Davey Jones	Sink 1000 ships.
Helm of Endurance	Complete the scarlet isles campaign.
Hourglass of the Illustrious	Attain perfect morale.
Keg of Hospitality	Host 100 mutiplayer games.
Key of Cutlass Bay	Complete the campaign.
Libram of the Curator	Unlock every ship in the game.
Mantle of Good Fortune	Complete the hilton crag campaign.
Mizzen of Doom	Sink 500 ships.
Mug of Friendship	Host a multiplayer game.
Order of the Eminent	Complete the black bay campaign.
Pail of Gloom	Few are they who walk this path.
Pennant of Persecution	Sink 100 ships.
Pipe of Exploit	Sink 5 ships in a multiplayer game.
Prong of Persistence	Complete the blood river campaign.
Purse of Plenty	Reach 5000 gold.
Quill of Calling	Reach 5000 Infamy.
Ring of Fable	Sink 20 ships in a multiplayer game.
Rudder of the Mercenary	Play every multiplayer map for both factions.
Seal of Vocation	Reach 20000 Infamy.
Shovel of Desecration	Recover the remains of captain mcgowan.
Signet of Avowal	Reach 10000 Infamy.
Sling of the Subjugated	Complete a Co-op Mission.
Snuffbox of Renown	Sink a Widowmaker in a multiplayer game.
Spanner of Foresight	Upgrade a ship to maximum stats.
Splinter of Competency	Sink a ship.
Star of Heroism	Sink 10 ships in a multiplayer game.
Tankard of Infamy	Sink a Goddess in a multiplayer game.
Tower of Midas	Reach 20000 gold.
Valediction of Sacrifice	Sink an enemy ship with a suicide ship.