Fable: The Lost Chapters Message Board  

Demon door #1 (Heroes guild)

use the lamp you get from graduating from the guild.
Inside: Elixer of life, a howl tattoo and some books.

#2 (greatwood Gorge)

Kill several commoners (traders, henchmen, etc) in front of it, Eat 10 crunchy chicks or already have horns and billowing red smoke.
Inside: Wellow's pickhammer

#3 (Greatwood caves)

To get through this door, you need a Combat Multiplier of 14+. To achieve this, build up your multiplier to 20+ in the Hobbe Cave and then fight the Troll that spawns just outside the door to get yourself back to 14+. It's tricky, but using a combination of Physical Shield and Slow Time should get you there.
Inside: The Cutlass Bluetane

#4 (Darkwood Marshes)

Kill The doors "guardians" which are hobbes.
Inside: Dark Will Users outit

#5 (barrow fields)

Eat around 30+ apple pies or red meat at full health if your not already "obese"
Inside: Will Masters Elixer

#6 (Witchwood Stones)

Spell The doors name H-I-T-S by hitting the columns in that order.
Inside:Health Augmentation, Chainmail Leggings, Resurrection Phial, Howl Tattoo, and more.

#7 (knothole Glade)

Shoot the door hard enough with a Crossbow/Bow.
Inside: Elixer of Life.

#8 (Grey House)

Be Married to lady grey.
Inside: Ronok The Axe.

#9 (Rose Cottage)

Give the door any gift.
Inside: Will users bright outfit.

#10 (Abandoned Road)

You need to show the door the Vright platemail set, The Dark will users outfit and the bandit outfit in that order.
Inside: Dollmasters mace.

#11 (Lychfield Graveyard)

Find Nostro's Armour (Helm,Sword,Shield and armour)

#12 (Headsmans Hill)

Defeat Thunder

#13 (The Darkwood Bordello)

Satisfy your self 10 times.
Inside: Pimp hat.

#14 (Lookout Point)

Defeat jack of blades (first time)
Inside: The fire Heart

#15 (Necropolis)

Give it all Your silver keys.
Inside: The Bereaver

I hope this post has helped you and if you have any questions, please don't hesitate to ask.