Updated 10-01-2023 05:17 PM
To build a bed place 3 pieces of Wool on the top and 3 pieces of Wood Planks on the bottom.
Then find a flower and break it and turn it into dye by opening a Crafting Table and placing It on any part of the grid. Place the Bed in the middle of the grid and place the dye anywhere next to it. Take it out of the grid and then the achievement should pop.