Build 45x Formwork Plank and unlock it in skill tree

Build 10x Aerated Concrete Block and 20x Conrete Lintel and unlock it in skill tree

Build 100x Drywall Board and unlock it in skill tree

Build 120x Mineral Wool and unlock it in skill tree

You have to screw 45 screws and unlock it in skill tree

You have to screw 7 screws and unlock it in skill tree

Build 400x Foundation Block and unlock it in skill tree

Build 6x Foundation Block and unlock it in skill tree

Build 200x Shinglet and unlock it in skill tree

Cut 30 Planks and unlock it in skill tree

Cut 15 Planks and unlock it in skill tree

Cut 18 Planks and unlock it in skill tree

Cut 10 Planks and unlock it in skill tree