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