Kill a creeper with arrows.

Create an Iron Golem.

Catch and cook a fish!

Harvest some leather.

Craft and place a sign.

Smelt an iron ingot.

Breed two cows with wheat.

Attack and destroy a monster.

Construct a better pickaxe.

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

Use planks and sticks to make a sword.

Craft a workbench with four blocks of wooden planks.

Open your inventory.