Here is the full list of all 50 Chaos Galaxy 2 achievements.
Use Galactic Empire to complete the game.
Use Imperial Court to complete the game.
Use Royalist Alliance to complete the game.
Use Regent Forces to complete the game.
Use Southern Principality to complete the game.
Use Northsky Fleet to complete the game.
Use Eastgalaxy Company to complete the game.
Use Emishi Pirates to complete the game.
Use Grand Armada to complete the game.
Use Lycurgus Corps to complete the game.
Use Aerie Assassins to complete the game.
Use Omnic Apocalypse to complete the game(without choosing the peaceful coexistence).
Use Free Stars to complete the game.
Use Eastocean Fleet to complete the game.
Use Westwastes Fleet to complete the game.
Use a vassal faction to complete the game.
Blackdragon Spawns arrives the Galaxy.
Blackdragon fleet be destroyed.
All alien fleets in the Galaxy were destroyed.
Free Stars destroying Southern Principality.
Emishi Pirates destroying Eastgalaxy Company.
Imperial factions destroying the Imperial Foe.
Imperial factions spending imperial influence to claim the Emperor.
Princess Jing being supported as the Emperor by Imperial factions.
Royalist Alliance destroying the Regent Forces and choosing to rebuild the Imperial Court.
Princess Jing being murdered.
Princess Jing being exiled.
Princess Jing coming to a Imperial faction.
Galactic Empire being destroyed by a Imperial faction.
After Regent Forces destroying the Royalist Alliance, select Westwastes Fleet to continue the game.
After Royalist Alliance destroying the Regent Forces and choosing to rebuild the Imperial Court, select Eastocean Fleet to continue the game.
After the first battle with the alien fleets.
Emishi Pirates capturing Shendu.
Lycurgus Corps capturing Shendu.
Eastgalaxy Company capturing Shendu.
Omnic Apocalypse capturing Shendu.
Aerie Assassins having all the following planets: Hydaspes, Tyre, Chaldea, Aerie, Sheba, Gedrosia, Badr, Hegra, BlackStone, Casablanca.
Randomly taking place when having the planet Thinis.
When Aerie Assassins dosen't exist. The faction doesn't have the blueprint of Assassin and have the planet Aerie.
When Aerie Assassins dosen't exist. The faction doesn't have the blueprint of Space Dancer and have the planet Aerie.
The faction doesn't have the blueprint of Space Worm and have the planet Blackstone.
After the first battle between the Emishi Pirates and the aliens.
The Mozi Ark visit a player planet.
Player incorporate the Mozi Ark.
The Omnic Apocalypse destory the Ark fleet and choose the peaceful coexistence.
Use the Omnic Apocalypse to complete the game after choosing the peaceful coexistence.
Use the Blackdragon Spawns to devour all 80 planets in the Galaxy.
Use a Custom Faction to complete the game.
Use the Blackdragon Spawns to devour all 80 planets in the Galaxy without calling the Dragon.
Li Chengsong, Tigerhill, Hongyang, and Geshu Beidou are both in your faction.