Cleared Memory Meadow.

Throw diamonds at another player.

Craft and place a sign.

Build some bookshelves to improve your enchantment table.

Construct a Nether Portal.

Acquire diamonds with your iron tools.

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

Use planks and sticks to make a sword.

Attack and destroy a monster.

Construct a better pickaxe.

Craft a workbench with four blocks of wooden planks.

Harvest some leather.