Here is the full list of all 39 Arid achievements.
Got access to the Saltpeter Plant.
Discover what happened to the miners.
Reach the Moon Valley.
Opened the way in the Canyon.
Find the unfinished art.
Read 10 letters, notes or journals.
Find the Pool.
Find out the fate of the couple of lovers.
Find the curious mural.
Reach the Mining Town.
Something lurks in the darkness...
Hopefully the last one.
You unlocked access to the mines.
Repair 10 facilities.
Fix the bridge to get access to the refuge.
Encounter a sandstorm.
Find or craft an high quality tool.
Open your first shortcut.
Survive 1 day in the game (any difficulty)
Find a Dead Viscacha
Move on from the crashsite.
Wake up in the Atacama desert.
Obtained the Flare Gun.
You escaped the atacama desert alive!
Complete the game on Tourist or harder difficulties.
Complete the game on Explorer or harder difficulties.
Complete the game on Survivalist or harder difficulties.
Complete the game on Dead Man Walking.
Find the Bath Tub.
Find where the kid has gone.
Run away from the bees! Maybe it's safer at night..
Found an old acquaintance.
You discovered the secret of the waterfall.
A sane mad man in a world of sane madness.
Craft a herbs poultice.
Survive 10 days in the game (any difficulty).
Survive 50 days in the game (any difficulty).
Repair all 84 facilities (including story related).
Read all 36 letters, notes and journals.