The Steam key will only be available with a purchase. Due to Steam policy, it is not allowed to give away free keys.
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Thank you for taking the time to review the game.
I will check the controller you have mentioned.
Regarding the achievements: If you have acquired the game outside of steam, the steam integration won't be functional. It is a different version of the game. As a result, the achievements are not available.
Ok, cool. You can turn off the subtitles in the settings menu -> language -> subtitles. However, you should keep them on during the second half of the game, as the voice over is not complete yet.