Stay underwater for one full day without using potions.

Kill a skeleton with an arrow from more than 50 meters.

Attack and destroy a monster.

Gather all 16 colours of Wool.

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

Brew a potion.

Breed two cows with wheat.

Dye your bed a different color.

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

Open your inventory.

Construct a better pickaxe.

Use planks and sticks to make a pickaxe.

Punch a tree until the block of wood pops out.