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