Cheats...
	Game Of Thrones reference...
	Various Steam Achievements...

At the screen were Gabriel shows his face (after opening the book) and before you press [Space] to continue, press [Up] [Up] [Down] [Down] [Left] [Right] [Left] [Right] [Esc] [Space] to unlock a "Cheats" option, which includes options like "God mode", in the extras section of the pause menu. If you entered the code correctly, Gabriel will wink. Note: Enabling cheat options will prevent achievements from being earned and the game from being saved.

In the greenhouse, just as you defeat Pan's brother, stand in front of Pan's corpse. Directly behind you will be a statue on a plinth, in a sunken part of the terrain. The plinth is in a pool, and behind it is a dead soldier with a diary titled "Company Of Eddard S." The text also mentions "Poor King Robert", as Eddard's Captain.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A madman's on the loose	Release the Chupacabras from his prison.
Chaos Collector	Recover 30 Chaos Gems.
Classic Flavor	Cook a chicken in the old style.
Claw Master	Increase the Mastery Level of the Chaos Claws to the maximum.
Crushed rock	Destroy the golem.
Customer of the month	Spend a total of 20000 Experience Points at the Chupacabras' shop.
Death is not enough	Get rid of Zobek forever.
Dissipated storm	Finish off Satan's second acolyte.
Experienced	Gain a total of 10000 Experience Points.
Expert Silversmith	Recover all the Void, Chaos and Life gems.
False chosen one	Defeat the Paladin.
Family reunion	Gain the trust of Victor.
Femme fatale	Subdue Carmilla.
Good customer	Buy an item at the Chupacabras' shop.
Heart of stone	Kill the Gorgon.
Hunted hunter	Capture Raisa Vólkova.
Initiated in Mastery	Increase the Mastery Level of a weapon.
Inner Dracula	Shed your darkest self.
Kleidos Champion I	Complete all the Reminiscences of Sapphire challenges.
Kleidos Champion II	Complete all the Recollections of Ruby challenges.
Kleidos Champion III	Complete all the Reminders of Amethyst challenges.
Kleidos Champion IV	Complete all the Memories of Emerald challenges.
Kleidos Hero	Complete all of the Kleidos challenges.
Kleidos Legend	Complete all of the Kleidos challenges at Prince of Darkness difficulty.
Life Collector	Recover 30 Life Gems.
Multiple Pockets	Recover all the upgrades for the Relics.
Natural selection	Defeat Agreus.
Next stop: Castlevania	Survive the train trip.
Once upon a time...	Sabotage the Toy Maker's show.
Philanthropist	Collect all of the art.
Prince of Darkness	Complete the game at Prince of Darkness difficulty.
Specialist	Gain a total of 50000 Experience Points.
Start the path	Acquire a skill.
Sword Master	Increase the Mastery Level of the Void Sword to the maximum.
The apple of his eyes	Eliminate Satan's first acolyte.
The End	Annihilate Satan and save the world, again.
The Outer Limits	Complete 110% of the game.
The path of the Claws	Acquire all of the Chaos Claws skills and upgrades.
The path of the Sword	Acquire all of the Void Sword skills and upgrades.
The path of the warrior	Acquire all of the skills and upgrades.
The path of the Whip	Acquire all of the Shadow Whip skills and upgrades.
Vampire kiss	Accept Zobek's gift.
Veteran	Gain a total of 100000 Experience Points.
Void Collector	Recover 30 Void Gems.
Weapons Master	Increase the Mastery Level of all weapons to the maximum.
Whip Master	Increase the Mastery Level of the Shadow Whip to the maximum.