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