Here is the full list of all 18 Eufloria achievements.
Defend one of your own asteroids continuously for five minutes.
Complete the main game.
Complete "The Centre Cannot Hold" within 60 minutes.
Complete the campaign in under ten hours.
Attack an enemy asteroid and lose 300 seedlings in the process.
Gather five mines on an asteroid.
Destroy ten enemy seedlings using a mine explosion.
Discover an asteroid using a flower or a mine.
Send a flower or a mine over 50000 arbitrary distance units.
Complete Dark Matter Mode.
Gather 4000 seedlings on an asteroid.
Complete "200" without any of your own trees being destroyed.
Complete "Protection" without destroying anyone else's trees.
Find over 700 of the lost seedlings in the game.
Attack an enemy asteroid and destroy 200 seedlings in the process.
Gather ten flowers on an asteroid.
Battle for an enemy asteroid for ten minutes.
A pitched battle that lasts over 15 minutes and incurs 500 losses between all sides.