Dishonored's console commands are disabled by default, in this step-by-step guide I'm going to show you how to enable them.

Using console commands does not disable achievements.

Keep in mind that since console commands are disabled by default they are somewhat broken, so your mileage may vary.

For a comprehensive list of console commands:
https://sp.zhabite.com/sharedfiles/filedetails/?id=3403413866

First you need to locate your game files by default this should be either one of these:

• C:\Program Files (x86)\Steam\steamapps\common\Dishonored
  
• D:\SteamLibrary\steamapps\common\Dishonored

Then you need to navigate to config.

Alternatively paste either of these in your file explorer to instantly take you to config:

• C:\Program Files (x86)\Steam\steamapps\common\Dishonored\DishonoredGame\Config
  
• D:\SteamLibrary\steamapps\common\Dishonored\DishonoredGame\Config

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Now open DefaultInput or DishonoredInput in notepad.

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Ctrl+F m_pcbindings

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Now add to following at the end: .m_PCBindings=(Name="F1",Command="set Console ConsoleKey Tilde | set PlayerController CheatClass class'DishonoredCheatManager' | EnableCheats")

In this case ~ is the key to open the console and F1 is the key to enable cheats. You can change these to any key you want.

Ctrl + S to save the file.

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Close notepad and right-click DefaultInput or DishonoredInput select properties and mark read-only.

Now you're all set open the console by pressing ~ and enable cheats by pressing F1 next time you launch the game!