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