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