Acquire diamonds with your iron tools.

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

Harvest some leather.

Catch and cook a fish!

Use Shears to obtain wool from a sheep.

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

Play a music disc in a Jukebox.

Construct a better pickaxe.

Use planks and sticks to make a pickaxe.

Open your inventory.

Trigger a cross-class combo with a character you control in single-player mode.

Complete a level without letting go of boost