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