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