I don't know if this is fully correct but I'll give it my best shot as Im waiting for my game to update.
Laden With Treasure [20G]
--Have 20 or more chests(any rarity) on your ship at the same time.
You Can Always Trust The Untrustworthy [30G]
--Steal & Cash-In another player's Captains chest.
When You're A Professional Pirate [20G]
--Earn 10 commendations in Gold-Hoarders/Order of The Souls/Merchant Alliance(Tab/Start will show you how many you have unlocked).
Tactical C*****r [20G]
--Slay an enemy player after blinding them with vomit(stored in your bucket).
I'll Drink To That [5G]
-- Five or more players drinking Grog in the tavern at the same time, triggering the drunk player animation.
Aye of Reach [5G]
--Purchase a skin customization for the sniper rifle at the weaponsmith(always go gold).
You Fight Like A Merchant [10G]
--For the life of me I cant unlock this I assume you need to block an attack while talking to the enemy player through game chat(voice or at least I hope bc text would be awful).
How Appropriate! You Fight Like A Chicken [10]
--Block an enemy players attack then flee the fight(run away).
Self Entitled [10G]
--Purchase 10 different titles from the clothing trader(ex> Merchant Officer/Gold Master).
Did Everyone See That? [10G]
--While on an enemy ship engage in a sword fight with another player(or blunderbuss they might die though) successfully know them off their ship.
Kraken Good Job [15G]
--Shoot all of the Krakens Tentacles fending it off, saving your ship from destruction.
Perfect Dark [15G]
--Turn off all the lights on your ship(all of them even the ones below deck) then sail in & out of a storm.
Freinds Note Foe [10G]
--While encountering another player use the "Make Freinds" animation/emote.
Legends - "Cronch" [5G]
--Eat a Banana?
Legends - "The Skullduggers" [5G]
--With five or more players play music unlocking this achievement.