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