Dye your bed a different color.

Tame a Horse.

Bounce 30 blocks upward off a Slime Block.

Mine or purchase 30 Emeralds.

Kill a skeleton with an arrow from more than 50 meters.

Use a Dried Kelp block as fuel in a furnace.

Catch and cook a fish!

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

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

Brew a potion.

Construct a Dispenser.

Destroy a Ghast with a fireball.

Use Shears to obtain wool from a sheep.