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