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For the other completionists out there, the manuals are all available via the Steam store pages. Replacementdocs has a manual for the first game with the cover.
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Mobeeuz: For the other completionists out there, the manuals are all available via the Steam store pages. Replacementdocs has a manual for the first game with the cover.
Here are links for everybody to jump stright in (all in English):

Arkham Origins:
https://steamcdn-a.akamaihd.net/steam/apps/209000/manuals/BAO_PC_Manual_Eng_120513.pdf

Arkham City:
https://steamcdn-a.akamaihd.net/steam/apps/57400/manuals/BAC_GFW_Manint_ENG_102011.pdf

Arkham Asylum:
https://steamcdn-a.akamaihd.net/steam/apps/35140/manuals/BAA_G4W_man_inners_uk_v4.pdf

Arkham Knight:
https://steamcdn-a.akamaihd.net/steam/apps/208650/manuals/BAK_PC_ManInt_ENG_072015_v22_MC.pdf