The Corruption Within Walkthrough (100% Achievement Guide)

The Corruption Within is a short point and click adventure featuring ten Steam achievements.

Notes:

• All achievements are story-related.
• Always make sure to exhaust all dialogue options.
• Choices don’t matter.

• Knock on the door.
• Go to the right twice, then up.
• Knock on the door again.
• Interact with the green sofa three times.
• Go to the right four times.
• Take the green hose hidden in the bottom right corner.
• Now, go to the left three times and talk to the butler.
• Go to the left four times and try to take the bottle of whiskey.
• Talk to Francesca, the kitchen maid.
• Pick up the bottle of whiskey.
• Go to the right and talk to Molly.
• Head back to the butler and interact with the stairs multiple times.
• Talk to the butler, then go up twice.
• Head to the right-most door and interact with the painting twice.
• Enter the room ahead and interact with the chest of drawers twice.
• Go downstairs, then to the left.
• Outside again, go to the right and interact with the shed door twice.
• Go to the right, up, then to the right three times.
• Examine the purple plant in front of the abandonded house to find a screwdriver.
• Go to the right, open your inventory (MMB) and use the spanner on the mortar.
• Go to the left three times, then down.
• Back in the mansion, enter the first floor.
• Go to the right twice, then up.
• Find a book in the desk on the left.
• Try to access the second floor again.
• Now, go left twice and up once. Talk to Charlotte.
• Enter the next room on the left.
• Head to the right four times and enter the room ahead. Talk to Charles.
• Leave and go to the right. Examine the console table twice to find some matches.
• Go up and talk to Penelope.
• Go downstairs and talk to the Isabelle in the music room.
• Now, go to the right and talk to the servant.
• Backtrack to the old barn. Talk to Gary.
• Enter the mansion again and head to the left three times, then go up.
• Pick up the magnifying glass.
• Leave and go to the second floor.
• Enter the second room on the left and examine the footlocker six times.
• Use the maginfying glass on the painting.
• Leave and enter again. Talk to Charlotte.
• Outside the room, interact with the green console table three times.
• Click on the buttons in this order: 4-3-1-5-2-1-5-3.
• At the lake, use the rune book on the yellow pillar. Code: 11-13-14-22.
• Back in the mansion, head to the second floor, then enter the right-most room.
• Talk to Giles, then head outside and backtrack to the hanging body.
• Go up and use the iron key on the rock face.
• Enter the mansion, then go to the right twice and pick up the oil lamp.
• Back in the cave behind the hanging body, go up.
• Interact with the bones on the left three times to find a locket.
• Enter the mansion again. Talk to everyone downstairs.
• Head to the second floor and interact with the vase on the very right.
• Go to the right and use the nail file on the pulpit.
• Inspect the pulpit. Code: 13-21-24-23-11-12-22-14.
• Talk to the Gary in the dining room downstairs.
• Head back to the second floor, then try to go to the left.
• Now, go to the first floor and enter the right-most room.
• Use the screwdriver on the musical box.
• Open your inventory and use the bedroom key on the door in front of you.
• Head outside and go to the lake/shallow waters location.
• Use the wire and the hose on the wagon.
• Interact with the shallow waters and take the wallet on the left.
• Back in the mansion, talk to everyone downstairs.
• Head to the second floor and talk to Penelope.
• Backtrack to the previous room and inspect the mirror twice.
• Talk to Isabelle in the music room downstairs.
• Go to the second floor, then to the left.
• Enter the room in front of you.
• Interact with the dresser to open a secret room.
• Go to the right and interact with the chest twice.
• Leave and enter the bedroom on the very right. Talk to Giles.
• Now, enter the room on the very left.
• Head to the kitchen and talk to Francesca.
• Back on the second floor, enter the left-most room again.
• Talk to the couple.
• At the left-most lake location, inspect the prominent rock three times.
• Now, find a book in the chest (secret room) on the second floor.
• Talk to Isabelle downstairs.
• Go to the right twice, then down.
• Interact with the left cage multiple times.
• Take the whip and use it on the left cage.
• Investigate the iron maiden, then use the spanner on the it.

Thanks to Hanni for this great walkthrough. you can also check out this guide from the Steam community.