Here is the full list of all 10 Galaxia Conquestum achievements.
Beat the game on easy difficulty.
Beat the game on normal difficulty.
Beat the game on hard difficulty.
Destroy 100 ships.
Destroy a battleship.
Destroy a super battleship.
Win the game as The Collective.
Win the game as The League.
Win the game as The F5 Directive.
Win the game as each faction.