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