What a game... Outlast games are really a superb horror experience and they have a special place in my heart when it comes to gaming. If you have played through the first Outlast and thought it was bizarre, gruesome and sick, then you'll absolutely go crazy with this one.
In Outlast 2, you play as a camera man, called Blake, who flies to rural Arizona, with his wife and reporter, Lynn, to search the case of the murder of a pregnant woman, Jane Doe (whose father you'll meet briefly ingame).

SPOILER:
Throughout your adventure, you'll have only your trusty camera to rely on to record the terrible things you witness amongst the community of Temple Gate, and at the same you'll be running away from almost everyone you meet. You'll visit the town, wonder deep in the forest and ultimately spelunk down into the mines, in search of your wife, that has been captured, first by the Temple Gate residents, whose faction is called the Testament of the New Ezekiel, and later by Val and the Heretics.
As you venture further and further into the deep misteries of what's happening, you'll also go back to Blake's past and meet Jessica, a childhood friend of Blake, who was sexually molested by Father Lautermilch, a teacher in the catholic school they studied in.
You'll constantly go back and forth between the past that haunts Blake and the present, as the plot thickens.

I really loved this game, I can't say if it's better or worse than the first Outlast because I think both have their strong and weak points, even though Outlast 2 is a much more macabre game than its predecessor.
It's far longer and far harder, making me prefer it more as a horror experience.
From the achievement hunting point of view, most of the achievements are fairly easy to do, being the 2 hardest ones the ones where you have to finish the game in insane mode, which is the hardest mode in the game (no checkpoints in a 2+ hour long game, if you speedrun it!), without ever reloading your battery. It took me a whole afternoon to go through those achievements and I think they made me more stressed and worried than I've ever been in a game.

Overall, I recommend this game to the fullest, wether or not you get it in a sale or not, it's worth the 25€ price if you are a fan of Outlast games.
All I can say is that Red Barrels really set the bar high amongst this category with this game. Good job!