Here is the full list of all 69 Halcyon 6: Starbase Commander achievements.
Killed the Chruul Behemoth.
Killed the Chruul Desolator.
Made an ally of the Voraash.
Killed the Chruul Crusher.
Made an ally of the Yabblings.
Built a tier five ship.
Made an ally of the Collective.
Made an enemy of the Voraash.
Made an ally of the Korzan.
Killed the Chruul Marauder.
Built a tier four ship.
Made an ally of the Xlar-Yanthu.
Built 20 Base Rooms.
Killed the Chruul Chimera.
Researched 20 techs.
Destroyed 100 Chruul ships.
Had an officer reach Level 10.
Defeated the Chruul at New Terra.
Successfully cleared a Chruul spire.
Built a tier three ship.
Rescue 15 colonies from a Chruul fleet.
Decided to pay off the Yabbling debt for the next couple millennia.
Built 10 Base Rooms.
Researched 5 techs.
Researched 10 techs.
Destroyed 25 pirate ships.
Built a tier two ship.
Destroyed 10 pirate ships.
Have a ship reach rank four or higher.
Destroyed 25 Chruul ships.
Had an officer reach Level 5.
Rescue 5 colonies from a Chruul fleet.
Built 3 Base Rooms.
Destroyed 10 Chruul ships.
Have a ship reach rank three.
Have a ship reach rank two.
Built a base room.
Destroyed the Chruul Spawn Pit.
Have a ship reach rank one.
Lose your first Green Shirt in ground combat.
Had an officer reach Level 2.
Built a tier one ship.
Finished the tutorial.
Lost 10 Green Shirts in ground combat.
Lost 25 Green Shirts in ground combat.
Lost 50 Green Shirts in ground combat.
Lost 100 Green Shirts in ground combat.
Destroyed 100 pirate ships.
Recruit 10 officers.
Made an enemy of the Yabblings.
Made an enemy of the Korzan.
Made an enemy of the Collective.
Made an enemy of the Xlar-Yanthu.
Lost 10 officers in the line of duty.
Made an alliance with the pirate Willa.
Made an alliance with the pirate Savak.
Made an alliance with the pirate Khut.
Did not ally with any of the pirate captains.
Defeated Admirax Zeb and his pirates.
Killed the Mothership.
Rescue 30 colonies from a Chruul fleet.
Tried to give the station to pirates...seriously?
Successfully multiplied O'Brien.
Successfully beat the game on Cadet difficulty.
Successfully beat the game on Lieutenant difficulty.
Successfully beat the game on Commander difficulty.
Successfully beat the game on Captain difficulty.
Successfully beat the game on Admiral difficulty.
Successfully beat the game on Grand Admiral difficulty.