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