Dye your bed a different color.

Power a Furnace with Lava.

Stay underwater for 2 minutes.

Cure a zombie villager.

Gain the trust of an Ocelot.

Relieve a Blaze of its rod.

Acquire 30 Emeralds by trading with villagers or mining.

Wear a full suit of Iron armour.

Smelt wood trunks using charcoal to make more charcoal.

Craft and place a Flower Pot.

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

Swim in lava while having the Fire Resistance effect.