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