The Tempest Add-on for Endless Legend - Emperor Edition has 16 achievements.
Attack an army containing only land units with an army containing only submersible units.
Ambush an enemy army from a fog-bank.
Control every Fortress in the world.
Control each of the unique facilities across any number of playthroughs.
Complete your control of an ocean by trading for a Fortress.
Complete 5 quests for the Fomorians in a single game.
Capture 50 Fomorian-controlled Fortresses across any number of playthroughs.
Win a battle using an army containing each type of Fomorian warship.
As Morgawr, win the game without ever building or purchasing land units (except for Settler units).
As Morgawr, control an ocean which borders 4 or more land regions you control.
As Morgawr, control one region on at least 4 different continents.
As Morgawr, use a Black Spot to prompt the elimination of an empire by a third party.
Win a game with the Morgawr.
Win a Shared Victory.