Mine or purchase 30 Emeralds.

Place a fully explored Map into an Item Frame.

Travel by minecart to a point at least 500m in a single direction from where you started.

Craft and place a Sign.

Dye your bed a different color.

Kill a creeper with Arrows.

Stop starvation using Rotten Flesh.

Build some bookshelves to improve your enchantment table.

Take down Maurice

Relieve a Blaze of its rod.

Power a Furnace with Lava.

Construct a Nether Portal.

Turn wheat into bread.