Here is the full list of all 31 Sid Meier's Starships achievements.
Win the game as Harmony
Win a Science Victory
Increase the population on a planet to 10
Raise a planetary improvement to level 5
Defeat the Pirate planet
Upgrade the stealth module to level 6
Win a Population Victory
Win the game as Supremacy
Research a tech to level 4
Take over an enemy's home planet
Destroy a ship with a torpedo
Win the game as Purity
Win a Wonder Victory
Win a mission by bringing your flagship to a warp portal
Create a warp portal between two planets
Control 5 Galactic Wonders
Repair a critical hit on a ship in your fleet
Have 4 or more fighters on the map at once during a battle
Upgrade the lasers on your ship
Use a jump gate during battle
Have a ship in your fleet move 7 or more hexs in one turn during a battle
Win a mission by bringing the colony ship to a warp portal
Bring a planet fully into your empire
Upgrade the population on an earth-like planet
Score a critical hit on an enemy ship
Travel to another planet
Defend your home planet
Give away a tech through negotiating with an enemy
Research 5 techs to level 4
Start a game using a save game from Beyond Earth
Win a Domination Victory