Wear a full suit of Iron armour.

Craft and place a sign.

Use planks and sticks to make a sword.

Construct a Nether Portal.

Play for 100 days.

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

Kill a creeper with arrows.

Turn wheat into bread.

Smelt an iron ingot.

Construct a furnace out of eight cobblestone blocks.

Use planks and sticks to make a hoe.

Punch a tree until the block of wood pops out.

Open your inventory.