Successfully complete the game to unlock Snake's bandanna and eye-patch for Gabriel.
Accept Laura's challenge andw in the Vampire Wargame in Chapter 6-3, "Castle Hall" to unlock it at the "Extras" menu.
Chapter 6-4: Easy experience
Play Chapter 6-4, "The Refectory" and kill The Evil Butcher. Do not take his key. Press Start, and select the "Reload Last Checkpoint" option to resume at the Quick Time Event where you need to hit The Evil Butcher's helmet. Kill The Butcher again, do not take his key, and repeat the process. You will earn about 1,000 experience points each time this is done.
Chapter 10: Defeating the Silver Warrior
Practically all of his attacks can be blocked. If you move close to him, he will use an attack that is incredibly easy to get a synchronized block on. Just 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. Basically, just get close, attack and block.
Maniac Mansion: Day Of The Tentacle reference
Begin the "Abbey Tower" level and immediately walk out to the left from the corridor you are standing in. Look for an old wooden cart against the side of the building. Destroy the cart, and there will be a fallen comrade on the ground underneath the debris whom has a note attached. Pick up the note. It makes reference to his sister Laverne and brother Bernard, and it is signed by "H.", which refers to the other main character known as Hoagie.
Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.
Brawler: Buy 15 combos.
Chapter I: Defeat the Ice Titan.
Chapter II: Get the Dark Gauntlet.
Chapter III: Acquire the power of the first Dark Lord.
Chapter IV: Kill the Crow Witch.
Chapter IX: Persuade Baba Yaga to open a portal to the Necromancer area.
Chapter V: Gain access to the Vampire Castle.
Chapter VI: Leave the Refectory with the Butcher's key.
Chapter VII: Survive the encounter with Laura.
Chapter VIII: Acquire the power of the second Dark Lord.
Chapter X: Vanquish the Gravedigger.
Chapter XI: Acquire the power of the third Dark Lord.
Chapter XII: Defeat Satan and save the world.
Chapter XIII: Open portal to dimensional prison.
Chapter XIV: Defeat the Forgotten One.
Crusade: Finish all levels in Knight difficulty.
Dark collector: Gather all the 30 Shadow gems.
Eleventy party: Get 110% completion rate in all levels.
Epic victory: Finish all levels in Paladin difficulty.
Experienced: Acquire 1000 experience points.
Gest: Finish all levels in Warrior difficulty.
Green collector: Gather all the 30 Life gems.
Light collector: Gather all the 30 Light gems.
Master achiever: Complete all the trials.
Master fighter: Buy all combos.
Master improver: Find all the secret Brotherhood arks.
Master jeweler: Gather all hidden magic gems.
Master of the reliquary: Gather all the fingers of Frankenstein.
Master philanthropist: Buy all the extra artwork.
Seasoned: Acquire 20000 experience points.
Skirmish: Finish all levels in Esquire difficulty.
Trials - Chapter I: Complete all the trials for Chapter I.
Trials - Chapter II: Complete all the trials for Chapter II.
Trials - Chapter III: Complete all the trials for Chapter III.
Trials - Chapter IV: Complete all the trials for Chapter IV.
Trials - Chapter IX: Complete all the trials for Chapter IX.
Trials - Chapter V: Complete all the trials for Chapter V.
Trials - Chapter VI: Complete all the trials for Chapter VI.
Trials - Chapter VII: Complete all the trials for Chapter VII.
Trials - Chapter VIII: Complete all the trials for Chapter VIII.
Trials - Chapter X: Complete all the trials for Chapter X.
Trials - Chapter XI: Complete all the trials for Chapter XI.
Trials - Chapter XII: Complete all the trials for Chapter XII.
Trials - Chapter XIII: Complete all the trials for Chapter XIII.
Trials - Chapter XIV: Complete all the trials for Chapter XIV.
Veteran: Acquire 100000 experience points.
Welcome to the Club: Buy a combo.