Defeat a Ravager.

Use the Totem of Undying to cheat death.

Build some bookshelves to improve your enchantment table.

Relieve a Blaze of its rod.

Craft and place a sign.

Wear a full suit of Iron armour.

Acquire diamonds with your iron tools.

Construct a furnace out of eight cobblestone blocks.

Attack and destroy a monster.

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.