You will get this as you go through the levels. At the end of each Level (4th floor of each part) is a boss. This achievement along with "Heart of Stone" and "Immortal Beloved" (provided you did not die during the game)will unlock once you leave the Mansion. 

Mansion = Bats - Beat them by lighting 4 fireplaces.

Attic = Stone Monster - Beat him by destroying his minions using the Eye of Sour-On (obtained during the attic level)

Basement = Giant Spider - You have to navigate around the maze in order to find the 4 sections the spider is in. Make sure you have the Flaming Branch (obtainable right before the battle) to beat him.

Catacombs = Zachery Graves - To defeat him, you will need to use the Skull of Enlightenment, the Eye of Sour-On or the Flaming Branch to beat his minions, then pick up the Hand Grenade and go near him and press A to set it off. Do this three (3) times then run straight up to exit the mansion when it starts shaking. 

**Note: Don't bother stopping on the Zachery Graves level to find anything while you are running out, you cannot search.

When you run into Ghosts and Monsters in the house, some will freeze you. You will be prompted how to get "unfrozen" (usually move the L stick side to side). Have this done to you 100 times to get the achievement.

All the monsters, ghosts, spiders, bats, skeletons can be killed by having a light around them. The ones that work for lights are the lanterns, candles (on some), torches, flares, flaming branch and the Eye of Sour-On. This achievement however, only pertains to the ghosts. You can go back and replay levels for this achievement. I got this after 2 full playthroughs and then level 1 of the Mansion.

You "die" when you are sent back to the last fireplace you stopped at. The fireplaces are checkpoints. Basically, for this achievement, when you are frozen, quickly follow the on-screen prompts to get out of it before your health is gone. This will unlock as long as you don't die while frozen once you leave the mansion.

While similar to the above achievement, this one means you can't die at all. You die when you are sent back to the previous checkpoint or fireplace. You can get this and the above achievement if you complete the game without dying. 

Watch your facial expressions. When your face is basically a skeleton looking face, your next encounter is death. Find small or large health to get you back to normal.

Also, if you die, you would need to start a new game to get this achievement. Starting a new game will erase all previous stats though.

Search every closet, chest, and bookshelf for these items. I found the Lead Pipe in the Mansion Level on floor 2 and the Rope on floor 4. The Bloody Candlestick was found on floor 3 of the Mansion. The Empty Revolver and the Rusty Knife were found in the Attic Level.

This is a multiplayer achievement as stated. Multiplayer can only be done locally and not over Live. You will need to begin a new game under Multiplayer to unlock this achievement.

Light sources come in the forms of Matches, Candles, Torches, Lanterns (there are 4: Normal, Red, Green and Blue), Cell Phones, Eye of Sour-on, Flaming Branch, Staff of the Magi-Straight and the Skull of Enlightenment. Cell Phones last the longest but don't give up that much brightness. The Eye of Sour-On, The Flaming Branch, Staff of the Magi-Straight and the Skull of Enlightenment can be used for quick hits on monsters, but they need to recharge, while the others you can only carry a few at a time.

Turn them on for this achievement. I got this on the last level of Catacombs during my 2nd playthrough.

During your searching, you may get small or large health packs. Find 100 and the achievement is yours.

As you move through the house, you will find various artifacts by searching through chests, dressers and closets. When you find the first one, this achievement will unlock.


List of Artifacts:

Winged Shoes
Tongue of the Beholder
Crowned Jewels
Jack O' Lantern
Black Cat Statue
Neutron Pack
Shearing fingers
Emerald Dagger
Telescope
Magnifying Glass
Gold Rod
Bronze Rod
Silver Rod
Hockey Mask
Bladed Glove
Chainsaw
Empty Revolver*
Rusty Knife*
Bloody Candlestick*
Lead Pipe*
Rope (Noose)*
*Needed for "In the Attic, with the Knife" achievement.
Maltese Falcon Egg
Cup of a Plumber
Gold Crown
Bronze Crown
Silver Crown
The Only Ring
The Bronze Fleece
A Hair

Grandpa's Journals = 32
Amanda's Diary = 28
Zachary's Chronicles = 24

There are also Gold Coins to collect along the way, however, these are not that important.

Here is a breakdown by level for Treasures and Journals:

Mansion 1: 0 Treasures; 7 Journals
Mansion 2: 2 Treasures; 5 Journals
Mansion 3: 2 Treasures; 6 Journals
Mansion 4: 2 Treasures; 4 Journals

Attic 1: 2 Treasures; 3 Journals
Attic 2: 2 Treasures; 6 Journals
Attic 3: 4 Treasures; 2 Journals
Attic 4: 3 Treasures; 2 Journals

Basement 1: 2 Treasures; 6 Journals
Basement 2: 2 Treasures; 6 Journals
Basement 3: 1 Treasures; 4 Journals
Basement 4: 2 Treasures; 5 Journals

Catacombs 1: 1 Treasures; 9 Journals
Catacombs 2: 1 Treasures; 5 Journals
Catacombs 3: 1 Treasures; 8 Journals
Catacombs 4: 2 Treasures; 6 Journals

Boss levels do not have any treasures or journals.

As stated, this is done in multiplayer. Multiplayer is local only not over Live. Also, while the last Boss level will be unlocked once you finish the game in Single Player mode, you actually need to play a full game under Multiplayer for this achievement. 

Using the Eye of Sour-On, the Flaming Branch, Staff of the Magi-Straight or the Skull of Enlightenment on your enemies multiple times will net you this achievement.

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