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