Destroy a Ghast with a fireball.

Kill a Mob while wearing the same type of Mob Head.

Play a music disc in a Jukebox.

Swim in lava while having the Fire Resistance effect.

Brew a potion.

Use a saddle to ride a pig, then have the pig get hurt from fall damage while riding it.

Stop starvation using Rotten Flesh.

Construct a Dispenser.

Bake a cake using wheat, sugar, milk and eggs!

Smelt an iron ingot.

Catch and cook a fish!

Cook and eat a pork chop.