Bridge Constructor
57 Achievements
15-20h
Pinocchio
Built a bridge which can support trucks out of wood alone, even though other materials were available.
31.6%
How to unlock the Pinocchio achievement in Bridge Constructor - Definitive Guide
While traversing the Camatuga map and its islands, there is a bridge selection screen that lists the length of each bridge and the materials that are available for use with each one. These materials are predetermined for each bridge. This trophy requires you to select any bridge that has any material other than Wood available and you only use Wood.
There are many bridges to choose from, but the first one you will encounter with 2+ materials is on the Westlands islands with Bridge 5. This trophy will unlock once you have safely taken two regular trucks across an entirely wood bridge.
See Truck insignia 'Tamassee' for information on the easiest bridges to build for cars and regular trucks. The solution there satisfies the requirement for this trophy.
This will only count so long as you have the option to use other materials besides wood. As wood is the cheapest material available you can easily add additional frames and supports to allow trucks to cross. Again remember that creating triangles are quite sturdy and will be able to support the weight of trucks better than other designs. If you are following the guide for getting all trucks across then this will unlock naturally as several bridges in the guide will use wood only.