The Waterborne Add-on for Tropico 5 - Penultimate Edition has 10 achievements worth 250 gamerscore.
Finish the Waterborne campaign with the Black Pearl in your possession
Complete Waterborne campaign
Have 1 of each waterborne buildings in a single playthrough
Have 3 Oyster Farms and a Jewelry Workshop
Complete "Treasure Hunt"
Have a fleet of 3 Fishing Trawlers
Fire missiles from a Nuclear Submarine during a battle against another player
Defeat Captain Plant in the final battle
Have 10 Floating Apartments and no residential buildings on land (excluding shacks)
Have 5 superpowers in Offshore Offices