Here is the full list of all 51 Space Wars: Interstellar Empires achievements.
Destroy 1 or more enemy ships at least 2 classes higher than you during a battle.
Destroy 5 or more enemy ships at least 2 classes higher than you during a battle.
Destroy 10 or more enemy ships at least 2 classes higher than you during a battle.
Destroy 20 or more enemy ships at least 2 classes higher than you during a battle.
Destroy 3 or more enemy ships in a battle.
Destroy 10 or more enemy ships in a battle.
Destroy 20 or more enemy ships in a battle.
Destroy 50 or more enemy ships in a battle.
Survive at least 10 rounds of combat during an invasion battle.
Survive at least 20 rounds of combat during an invasion battle.
Survive at least 40 rounds of combat during an invasion battle.
Survive at least 80 rounds of combat during an invasion battle.
Destroy an enemy Class II to IV ship.
Destroy an enemy Class V to VII ship.
Destroy an enemy Class VIII to X ship.
Complete a solo mission.
Complete 25 solo missions.
Complete 50 solo missions.
Achieve Fleet Admiral rank as a member of the Sol Faction.
Achieve Vice Admiral rank as a member of the Sol Faction.
Achieve Rear Admiral rank as a member of the Sol Faction.
Achieve Commodore rank as a member of the Sol Faction.
Achieve Empress' First rank as a member of the Genari Faction.
Achieve Nova Commander rank as a member of the Genari Faction.
Achieve Star Commander rank as a member of the Genari Faction.
Achieve Force Commander rank as a member of the Genari Faction.
Have a Sol Chief Engineer reach Elite level.
Have a Sol Helmsman reach Elite level.
Have a Sol Weapons Officer reach Elite level.
Have a Sol Science Officer reach Elite level.
Have a Sol Medical Officer reach Elite level.
Have a Genari Chief Engineer reach Elite level.
Have a Genari Helmsman reach Elite level.
Have a Genari Tactical Officer reach Elite level.
Have a Genari Marine Commander reach Elite level.
Win as a member of the Sol Faction.
Win as a member of the Genari Faction.
Destroy 3 or more enemy ships in an invasion battle with no allied ships or structures present.
Be the first player to detect 5 or more enemy ships in an invasion battle.
Survive or flee an invasion battle with less than 5% hull points remaining.
Use your force fields to absorb damage equal to or exceeding your hull points in an invasion battle.
Destroy an enemy ship 4 classes higher than you during an invasion battle.
Dealt the most damage in an invasion battle involving 8 or more players.
Capture 200 or more regions in a season on a single character.
Capture between 160 and 199 regions in a season on a single character.
Capture between 120 and 159 regions in a season on a single character.
Capture between 80 and 119 regions in a season on a single character.
Destroy 500 or more enemy player controlled ships in a season on a single character.
Destroy between 350 and 499 or more enemy player controlled ships in a season on a single character.
Destroy between 200 and 349 or more enemy player controlled ships in a season on a single character.
Destroy between 100 and 199 or more enemy player controlled ships in a season on a single character.