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