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