Smelt wood trunks using charcoal to make more charcoal.

Craft and place a Flower Pot.

Deal nine hearts of damage in a single hit.

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

Gain the trust of an Ocelot.

Brew a potion.

Craft and place a sign.

Wear a full suit of Iron armour.

Construct a Nether Portal.

Construct a furnace out of eight cobblestone blocks.

Construct a better pickaxe.

Throw diamonds at another player.

Harvest some leather.