Here is the full list of all 50 ELEX achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Killed 20 monsters.
Earned 1000 Elex shards.
Played 80 hours of Elex.
Completed - Survival
First jet pack flight
Killed 50 people
Cracked 50 safes
50 successful pickpockets
Teleported 20 times
Completed - Stolen Equipment.
Completed - Origin The Power of the Center.
Completed - Tramp Confederacy.
Completed - Decaying Powers.
Completed - Chaos of Emotions.E86
Joined the Berserkers.
Joined the Clerics.
Joined the Outlaws.
Completed - Zardom's Battle Plan.
Started a relationship.
Completed - The Claws.
Completed - Old Obligations.
Completed - Showdown with Kallax.
Sealed the fate of Abessa City.
Fed Mana to the Hybrid.
Sided against the Hybrid.
Served the Hybrid.
Completed 300 missions.
Learned all fighting skills.
Learned all survival skills.
Learned all dexterity skills.
Learned all character skills.
Learned all Berserker skills.
Learned all Outlaw skills.
Learned all Cleric skills.
Reached level 20.
5 companions
Fallen to death 20 times.
Modified weapons 20 times
Picked 100 locks.
Earned 10,000 Elex shards.
Earned 100,000 Elex shards.
Collected 20 pictures.
Cold is 10 or lower.
Cold value has reached 90
Killed 300 monsters.
Killed 1000 monsters.
Killed 20 Albs.
Killed 20 bandits.
Completed ELEX.
Found Calaan