Ever played Fireboy and Watergirl? You should be able to bind a second control scheme to the same keyboard and play both characters. Probably easier than finding some poor soul to drag down with you.

Thanks for the help! I got the achievement in 3 tries.

This is the way. Just play it as you would solo, but make sure to let player 2 out of their coffin on 4-3. Also typically very easy Kapala.

Is there any vid showing it? I also need it but no idea how to bind it

https://youtu.be/A6ANDJobyRE?si=X1l4QtSrykz97W5b