Construct a Nether Portal.

Tame a Horse.

Turn wheat into bread.

Smelt wood trunks using charcoal to make more charcoal.

Power a Furnace with Lava.

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

Catch and cook a fish!

Acquire diamonds with your iron tools.

Smelt an iron ingot.

Construct a furnace out of eight cobblestone blocks.

Construct a better pickaxe.

Use planks and sticks to make a sword.

Craft a workbench with four blocks of wooden planks.