Build some bookshelves to improve your enchantment table.

Construct a Nether Portal.

Cook and eat rabbit meat. [Bedrock Only]

Tame a Horse.

Discover a Shipwreck.

Dye your bed a different color.

Wear a full suit of Iron armour.

Kill a creeper with arrows.

Stop starvation using Rotten Flesh.

Craft and place a sign.

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

Catch and cook a fish!