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