Use a saddle to ride a pig, then have the pig get hurt from fall damage while riding it.

Construct a Nether Portal.

Brew a potion.

Construct a Dispenser.

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

Construct an Enchantment Table.

Attack and destroy a monster.

Use planks and sticks to make a pickaxe.

Play a round of Carrier Assault

Smelt an iron ingot.

Construct a better pickaxe.

Punch a tree until the block of wood pops out.

Perform 5 dog tag kills in Multiplayer