Feed a dolphin raw cod and have it lure you to treasure.

Visit all Nether biomes [Bedrock Only]

Relieve a Blaze of its rod.

Swim in lava while having the Fire Resistance effect.

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

Breed two Pandas with Bamboo.

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

Find an underwater ruin.

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

Catch and cook a fish!

Stop starvation using Rotten Flesh.

Build some bookshelves to improve your enchantment table.

Discover a Shipwreck.