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

Acquire diamonds with your iron tools.

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

Relieve a Blaze of its rod.

Smelt an iron ingot.

Befriend five wolves.

Harvest some leather.

Catch and cook a fish!

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

Turn wheat into bread.

Use planks and sticks to make a hoe.

Use planks and sticks to make a pickaxe.

Punch a tree until the block of wood pops out.