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