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