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