What are some "secret" unlockables no one talks about?

Secret unlockables:
1. make 3 plates of grilled cheese, and unlock the Grilled Cheese aspiration. Upon completion of that aspiration, you may summon an entire 8 serving plate of grilled cheese. This was available way before the Grand Deliciouso spell. Any teen or older may do it.
2. look at the achievement list.
3. secret achievement: bring a hermit into society, chopstick master (or something like that), and there are are others --- I'll think about it more.