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