On Chapter 6-4 (The Refectory), kill The Evil Butcher However, do not take his key! Instead, hit start, select "Reload Last Checkpoint," and you will be placed back to the Quick Time Event portion of the fight where you need to hit his helmet and start the sequence. Kill The Butcher again, but don't take his key Hit Reload Last Checkpoint -- you can repeat this until you have all the EXP you want (About 1000 EXP a pop).

Complete the game to unlock Snake's bandanna and eye-patch for Gabriel.

Solve the Vampire Wargame puzzle during the main storyline to unlock it at the "Extras" menu.

When you first begin the "Abbey Tower" level, immediately walk out to the left from the corridor you are standing in and look for an old wooden cart against the side of the building. Destroy the cart to find a fallen comrade on the ground underneath the debris, whom has a note attached. Pick up the note to read a reference to his sister Laverne and brother Bernard, and it is signed by "H.", which refers to the other main character known as Hoagie.

Note: This is a very slow process. When you reach the dead bog level after you ride the horse to get away from the lycanthropes, you'll come to a drop of point where you can't go back in the level after you drop off. You'll enter a Goblin camp where Goblins will respawn infinitely as long as you don't throw two grenades from a goblin that either throws one at you and misses or you grab the Goblin and perform the sequence of knocking the Grenades from the Goblins' hands. It's O.K. to throw one Grenade at the tree, but don't throw two at the tree or the Goblins will stop respawning indefinitely. Continue killing the Goblins for easy experience.You only get 5 experience points from each kill so it will take a while to get all the unlockables

ACHIEVEMENT - HOW TO UNLOCK
Master achiever (50 points) - Complete all the trials.
Dark collector (20 points) - Gather all the 30 Shadow gems.
Light collector (20 points) - Gather all the 30 Light gems.
Green collector (20 points) - Gather all the 30 Life gems.
Master jeweler (25 points) - Gather all hidden magic gems.
Master philanthropist (20 points) - Buy all the extra artwork.
Skirmish (15 points) - Finish all levels in Esquire difficulty.
Gest (20 points) - Finish all levels in Warrior difficulty.
Crusade (30 points) - Finish all levels in Knight difficulty.
Epic victory (40 points) - Finish all levels in Paladin difficulty.
Welcome to the Club (15 points) - Buy a combo.
Brawler (20 points) - Buy 15 combos.
Master fighter (25 points) - Buy all combos.
Experienced (10 points) - Acquire 1000 experience points.
Seasoned (15 points) - Acquire 20000 experience points .
Veteran (30 points) - Acquire 100000 experience points.
Master improver (25 points) - Find all the secret Brotherhood arks.
Eleventy party (40 points) - Get 110% completion rate in all levels. 
Chapter 1 (10 points) - Defeat the Ice Titan.
Chapter II (10 points) - Get the Dark Gauntlet.
Chapter III (15 points) - Acquire the power of the first Dark Lord.
Chapter IV (15 points) - Kill the Crow Witch.
Chapter V (20 points) - Gain access to the Vampire Castle.
Chapter VI (20 points) - Leave the Refectory with the Butcher's Key.
Chapter VII (25 points) - Survive the encounter with Laura.
Chapter VIII (25 points) - Acquire the power of the second Dark Lord.
Chapter IX (25 points) - Persuade Baba Yaga to open a portal to the Necromancer area.
Chapter X (30 points) - Vanquish the Gravedigger.
Chapter XI (30 points) - Acquire the power of the third Dark Lord.
Chapter XII (35 points) - Defeat Satan and save the world.
Trials: Chapter I (25 points): Complete all the trials for Chapter I.
Trials: Chapter II (25 points): Complete all the trials for Chapter II.
Trials: Chapter III (25 points): Complete all the trials for Chapter III.
Trials: Chapter IV (25 points): Complete all the trials for Chapter IV.
Trials: Chapter V (25 points): Complete all the trials for Chapter V.
Trials: Chapter VI (25 points): Complete all the trials for Chapter VI.
Trials: Chapter VII (25 points): Complete all the trials for Chapter VII.
Trials: Chapter VIII (25 points): Complete all the trials for Chapter VIII.
Trials: Chapter IX (25 points): Complete all the trials for Chapter IX.
Trials: Chapter X (25 points): Complete all the trials for Chapter X.
Trials: Chapter XI (25 points): Complete all the trials for Chapter XI.
Trials: Chapter XII (25 points): Complete all the trials for Chapter XII.

"Reverie" achievements
ACHIEVEMENT - HOW TO UNLOCK
Skirmish: Chapter XIII (15 points) - Finish the levels from Chapter XIII on Squire difficulty.
Gest: Chapter XIII (15 points) - Finish the levels from Chapter XIII on Warrior difficulty.
Crusade: Chapter XIII (30 points) - Finish the levels from Chapter XIII on Knight difficulty.
Epic Victory: Chapter XIII (30 points) - Finish the levels from Chapter XIII on Paladin difficulty.
Master of the reliquary (30 points) - Gather all the fingers of Frankenstein
Trials: Chapter XIII (30 points) - Complete all the trials for Chapter XIII.

"Resurrection" achievements
ACHIEVEMENT - HOW TO UNLOCK
Crusade: Chapter XIV (30 points) - Finish the levels from Chapter XIV in Knight Difficulty.
Epic Victory: Chapter XIV (30 points) - Finish the levels from Chapter XIV in Paladin Difficulty.
Gest: Chapter XIV (15 points) - Finish the levels from Chapter XIV in Warrior Difficulty.
Skirmish: Chapter XIV (15 points) - Finish the levels from Chapter XIV in Squire Difficulty.
Trials: Chapter XIV (30 points) - Complete all the trials for Chapter XIV.

Most of his attacks are blockable. When you move close to him, he will use an attack that is incredibly easy to get a synchronized block on. Simply block the moment you see him attacking and it will most likely be a synchronized block. Then, use the Direct Counterstrike combo while he is dazed and repeat the process. Once your attack is over, he will use the same strike as before, allowing you to block and attack almost indefinitely. This works for both the start of the battle and after you get your magic back. While this does take slightly longer than magic-infused attacks, this is useful if you are trying to finish the trial and want to prevent Pan from healing.

Press UP(2), DOWN(2), LEFT, RIGHT, LEFT, RIGHT, B, A at the loading screen. Note: Enabling cheat options will prevent achievements from being unlocked and the game from being saved.