Thug Life Achievement
Plunder 30 ships.
When piloting the Jackdaw, you will have plenty of opportunity to attack other ships. Once they are crippled you have two choices:
- You can continue to damage them and they will sink, leaving half of their loot to be plundered.
- You can board them by closing and holding and as long as you successfully complete the objectives which vary based on the size of the opponent, then you will capture all of their loot. Once you progress far enough into the story you will then also have the options of using their ship to repair the Jackdaw or send the ship to join Kenway's Fleet.
Which choice you make doesn't matter, either way it will count toward the plundering requirement. You will likely plunder hundreds of ships throughout the game, so this will unlock relatively early.