Vegetarian

Vegetarian is a self-imposed-handicap badge: reach the 99-day mark without ever eating anything classified as meat, including stew that contains meat. Rated 4 difficulty stars for 4 diamonds, the challenge is not combat but discipline, because meat is the most abundant and convenient food source in the game, and you must deliberately avoid it for the entire run.

The trap is the stew clause. Even a hearty stew counts as meat the moment a meat ingredient goes into the pot, so you have to cook meat-free recipes only and stay vigilant about what you eat in a panic when hunger spikes. One careless bite voids the whole 99-day attempt, which is exactly why this earns four stars despite no special boss or timer.

Build your run around alternative food: fish, berries, crops, and any vegetable-based cooking the game allows. Fishing pairs especially well here since it is a renewable non-meat protein. Stockpile plant and fish food early so you are never tempted to grab meat in an emergency, and double-check every stew's ingredients before eating. Survive all the way to day 99 clean and the badge, plus 4 diamonds, is yours.