and I try a lot of keybinding... Or did I miss something ?

Do I need to kill the capybara guard too to unlock this achievement? If so, how? Or am I missing another animal, even tho' I've searched high and low and got to grips with the game world?

How do I change the language?

Bloody room with the rabbit painting at the end is what im referring to. is there a use to this room and the skulls or am i stupid?

I cheesed this by getting it stuck in a corner and spamming shots, I feel like I wasn't understanding something about the game doing that though. Am I meant to have stronger weapons or are there movement techs I am not understanding?