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