Hidden achievements are for exploring all areas, completing Stamp Cards and finishing the game. Hot Dog! - stand on a campfire with the hot dog outfit for a while. Corgi Coat Connoiseur - bake yourself in the oven (in a cave in the first area). The Best Fertilizer - water a plant, then poop on it. Corgi Fashionista - collect all wearable items (outfits, flags, etc.). A Full Sanctuary - rescue all animals.