Spiritfarer: Farewell Edition

Your best bet when going for this achievement is to try and have at least 10 of every crop anytime you visit the shop as well as checking back every day after you've completed some errands as they will rotate out. This is actually an easy achievement as many of the errands will require items you'll likely already have from needing to complete the main game. I recommend holding on to a few diamonds towards the end of the game as his last important errand is a treasure map to the last unlockable shrine. Be wary of selling him items as they may be needed for the errands, so always check them first.