Here is the full list of all 39 Arid achievements.
Repair 10 facilities.
Find or craft an high quality tool.
Encounter a sandstorm.
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.
You unlocked access to the mines.
Hopefully the last one.
Something lurks in the darkness...
Discover what happened to the miners.
Opened the way in the Canyon.
Got access to the Saltpeter Plant.
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.
Reach the Mining Town.
Reach the Moon Valley.
Find the Pool.
Find the curious mural.
Find the unfinished art.
Find the Bath Tub.
Find out the fate of the couple of lovers.
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.
Fix the bridge to get access to the refuge.
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 10 letters, notes or journals.
Read all 36 letters, notes and journals.