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