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