Here is the full list of all 20 Gaia achievements.
Build the main assembler.
Build a turret.
Drink glowshade.
Get raided by 5 rompos and survive.
Die from radiation.
Enter a cave system.
Kill a King Scorpion.
Get raided by 10 rompos and survive.
Drink nightstalker at night.
Have 15 wind turbines and 15 solar panels.
Steal from a trader.
Kill 5 amaroks and 5 harpies.
Eat human meat.
Build the Ancient assembler.
Get raided by 4 ironhammers and survive.
Get raided by 15 weevils and survive.
Build 10 minigun turrets, 5 plasma turrets and 5 cluster missile turrets.
Destroy a dropship before it lands.
Escape the planet in the Tempest.
Kill a barghest with fire without catching fire yourself.