With the season 7 update the option to purchase your own ships has been added.
For this achievement you simply have to set sail using your purchased ship.
From the main menu go to Adventure, and press my ships. From here you will be asked to purchase a ship. The options are :
- Brigantine - 375,000 Gold
Obviously the Sloop is the cheapest, but buy whichever you will use more.
Once selected give the ship a name and your good to go!
You will be taken to a screen that shows your ships information such as it's sails and name. Simply press
to set sail and it will unlock!
If you have purchased a ship and didn't set sail, make sure you do it from the My Ships option and not a normal ship.