The Waterborne Add-on for Tropico 5 - Penultimate Edition has 10 achievements worth 250 gamerscore.
Fire missiles from a Nuclear Submarine during a battle against another player
Finish the Waterborne campaign with the Black Pearl in your possession
Defeat Captain Plant in the final battle
Complete "Treasure Hunt"
Complete Waterborne campaign
Have a fleet of 3 Fishing Trawlers
Have 3 Oyster Farms and a Jewelry Workshop
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