how do i unlock the hidden lightning director achievement ? i finished the game, i have 8/9 but i couldn't get the last one

Menu doesn’t show in Ultrawide, making it impossible to start the game. I had to use -screen-fullscreen 0 -screen-height 1080 -screen-width 1920 to initialize the game, then it worked.

how do you pass the fiery rock phase ? i just dont get it. thanks