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