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