Here is the full list of all 34 XYLITH - there are Hostile Planet achievements.
An award for discovering a new species
You have saved your game
You have defeated Manis!
You have defeated Gorus!
You have defeated Lord Clavis!
You have saved Laesh!
You have defeated Omga
You have defeated Eyega!
You have defeated Kryptocyst!
You have attained level 10
You have attained level 100
You have reached level 200!!
You adopted your first Pet!
You have passed through a new door!
You have slain a Moquur
You have defeated Valeen!
You have found a rare Dragon Horn!
You have found the ultra rare Harp!
You have Crafted Ammo
You have Crafted a Healing Salv!
You have Successfully Repaired a Turret!
You have Successfully Repaired a Water Pump!
You have defeated a Caladox!
You have visited a Capitol City!
You have discovered all the music Discs
You have discovered an Emerald Mother Lode!
You have discovered a Gold Mother Lode!
You have discovered your first Diamond!
You held your breath for a really long time!
You have sold goods to a base computer!
You have discovered RareEarths!
You found a rare Chocolate Cake!
An Award for Equipping the rare VaxMod!
You have submitted a score to the High Score Database