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