This achivement is unlocked for completing all three quests on the Candy Construction Capers level. It is the third level in the tutorial worlds.
One asks you to copy a house using the copy tool.
Just select the house with the copy tool and stick it somewhere else on the map.
One asks you to paint a house
Use the paint tool with any colour and paint over the house (you don't have to do the whole house I got this by doing a wall)
One asks you to build a wall
Use the build tool to place bricks and make a wall (it doesnt have to be perfect mine looks nothing like a proper wall but I still got the golden piece)
This may also net you the "Rank - Explorer Builder!" achievement if you have completed the previous worlds.
Good luck and enjoy LEGO Worlds!