Construct a Nether Portal.

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

Tame a Horse.

Construct an Enchantment Table.

Mine 1,728 Cobblestone and place it in a chest.

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

Acquire diamonds with your iron tools.

Smelt an iron ingot.

Harvest some leather.

Construct a better pickaxe.

Attack and destroy a monster.

Craft a workbench with four blocks of wooden planks.

Open your inventory.