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