The Waterborne Add-on for Tropico 5 has 10 achievements.
Complete "Treasure Hunt"
Complete Waterborne campaign
Defeat Captain Plant in the final battle
Finish the Waterborne campaign with the Black Pearl in your possession
Have a fleet of 3 Fishing Trawlers
Have 3 Oyster Farms and a Jewelry Workshop
Fire missiles from a Nuclear Submarine during a battle against another player
Have 10 Floating Apartments and no residential buildings on land (excluding shacks)
Have 1 of each waterborne buildings in a single playthrough
Have 5 superpowers in Offshore Offices