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