Found one of the gifts the first time you're in the city. Where the rest at ?

Hi! How can I get these achievements?

I'm in Chapter 2 with the fuel can going down to the basement and can't leave the bottom of the stairs to enter the room. I watched a YouTube video so I can see other people can do it, but I'm stuck in the air and can't go anywhere. Unless there is a fix, I have to call it a day on this one....

the VHS effect is too vague..

After adjusting the graphics settings in the options interface of the game, the mouse cursor cannot be moved anymore.At this point, I can only restart the game.