Spreading Spores Trophy in Yoku's Island Express
Complete Rinri's quest
How to unlock Spreading Spores
Rinri can be found high up in the village and will task you with spreading mushroom spores to a variety of areas of the map, each identified with a rough description of the environmental conditions of the area - you'll find a special area of ground at each location, which have to be visited in the right order. Once you deliver the final set of spores, return to Rinri to complete the quest and earn this trophy.
The start of THIS VIDEO from YouTube user xWinG demonstrates this quest and trophy.