This achievement is earned on the Mountain puzzle which is directly after the Bedroom Puzzle. You start on the top layer so walk around and stand on the purple roof then press
to walk on the Red Floor and acroos the platform into the Yellow Arch press
to reposition the camera and the Red & Blue platforms, stand on the Red and press
now walk along the platform to collect the 1st Honeycomb, now walk back to the Red and Blue platforms and position yourself stood as close to the Red platform as you can but not on it
to collect the 2nd Honeycomb, now press
to descend and walk along to the end next to the Red Wall and press
to reveal the 3rd Honeycomb and with that it should unlock.
The reason I have used a Bold text is this level is glitchy and it causes a section of the platform to despawn and you will fall and have to restart.