Crack the celerium worm.

Jailor or executioner.

Listen and think before you shoot.

Attack and destroy a monster.

Travel by minecart to a point at least 500m in a single direction from where you started.

Construct a Dispenser.

Catch and cook a fish!

Construct a Nether Portal.

Harvest some leather.

Acquire diamonds with your iron tools.

Construct a furnace out of eight cobblestone blocks.

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

Use planks and sticks to make a pickaxe.