Contraption Creator
Common41.9%GrindOptional
Conducted Technology Development 15 times.
Conduct 15 Technology Developments at Igashichi Iizuka's workshop in Yokohama. Each costs Foreign Books, which you pull from treasure chests around the map, so this is really gated by how many books you've hoarded - keep looting chests and spend the books as they come in until you've done fifteen developments.