Proof of building strong bridges to span the depths between continents, making all the world one.
On Day 9, three Canvas of Prayers quests will spawn: Roadworks I, II, & III. These quests require a total of 6 items.
Roadworks I: items obtained by interacting with the light on the blue guard stations on Luxerion NW strong bridge and Wildlands SE strong bridge respectively.
Roadworks II: items obtained from two treasure spheres, one near Oasis Lighthouse in Dead Dunes, and the other outside the giant white debris to the south of Aryas Village in Wildlands.
Roadworks III: items obtained from two treasure spheres, one in a Yusnaan underground passage, and the other inside the entrace of Grave of the Colossi Shrine in Dead Dunes. They are along main story progression pathways so should be very hard to miss.
The achievement will unlock after completing all three quests.