Bounce 30 blocks upward off a Slime Block.

Burn up a zombie.

Harvest some leather.

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.

Construct a furnace out of eight cobblestone blocks.

Breed two cows with wheat.

Acquire diamonds with your iron tools.

Build some bookshelves to improve your enchantment table.

Construct a better pickaxe.

Turn wheat into bread.

Use planks and sticks to make a hoe.

Craft a workbench with four blocks of wooden planks.