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