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