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