This one is pretty self-explanatory, and once the Feat is unlocked, you'll enjoy a permanent boost of +2☌/4☏ to your character's core body temperature. Cold Fusion: To unlock this one, simply spend 100 days (2400 hours) outside.Once you complete this Feat, you'll obtain a 10% benefit from each book you completely research. There are multiple copies of each kind of Research Book scattered all over the map, and they can take up to 5 to 25 hours to read, depending on the book. Book Smarts: You'll have to do 250 hours of research, which means reading Research Books.Challenges don't provide any special bonus, and once you've completed one, all you have is a Challenge badge to prove you achieved something. Once you've completed a specific Feat, you'll be granted a gameplay perk that makes surviving in The Long Dark a little bit easier.
