Power a Furnace with Lava.

Swim in lava while having the Fire Resistance effect.

Craft and place a Flower Pot.

Breed two cows with wheat.

Turn wheat into bread.

Construct an Enchantment Table.

Construct one type of each tool (one pickaxe, one spade, one axe and one hoe).

Throw diamonds at another player.

Cook and eat a pork chop.

Construct a furnace out of eight cobblestone blocks.

Smelt an iron ingot.

Attack and destroy a monster.

Use planks and sticks to make a sword.