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