Catch and cook a fish!

Craft and place a sign.

Kill a creeper with arrows.

Create an Iron Golem.

Score off the post or cross bar in a match

Wear a full suit of Iron armour.

Harvest some leather.

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

Use planks and sticks to make a hoe.

Use planks and sticks to make a pickaxe.

Craft a workbench with four blocks of wooden planks.

Open your inventory.