No missable achievements (plus 27 unknown)
Sign in with Steam or Xbox to track your progress, and:
Defeat an enemy planet.
Fire Nuclear Missile super weapon.
Fire Solar Laser super weapon.
Fire Asteroid Diversion super weapon.
Win an online multiplayer match.
Win a multiplayer match with at least two players.
Fire all the superweapons during the same turn.
Win a multiplayer match with at least four players.
Outlive 7 AIs in one match.
Defeat two enemy planets in one turn.
Grow five cities to their maximum populations.
Unlock all technologies.
Beat the Impossible AI.
Destroy 100 cities over any number of games.
Win a multiplayer match with eight players.
Win a match with less than 200M population left.
Win 5 online multiplayer matches.
Win 10 single player games.
Win 25 single player games.
Win 10 online multiplayer matches.
Win 25 online multiplayer matches.
Win 50 online multiplayer matches.