Here is the full list of all 27 Starsand achievements.
Kill 35 aliens
Wear every piece of armor
Find all Chronicles
Check what lies at the bottom of the lake
Find all oasis
Get a running go and jump in the water from a height
Find all locations
Wear the Gods Suit
Repel the swarm of flies with a torch
Drink too much water
Cut down 20 canapa plants
Find the credits stele
Place 10 markers or turrets on the map
Explore the pyramid
Survive a week without eating animals
Ride a camel
Experience death for the first time
Complete the tutorial
Survive 1 day in the desert
Kill 3 aliens with a single explosion
Kill 15 aliens using traps
Cook all the recipes
Burn the nest
Kill 60 aliens with the Seeder rifle
Follow your destiny through the portal