Travel by minecart to a point at least 500m in a single direction from where you started.

Use an Elytra to fly through a 1 by 1 gap while moving faster than 40 m/s.

Eat a Notch Apple.

Kill the Wither.

Mine 1,728 Cobblestone and place it in a chest.

Build some bookshelves to improve your enchantment table.

Brew a potion.

Craft and place a Flower Pot.

Smelt wood trunks using charcoal to make more charcoal.

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

Enter an End Portal.

Use Shears to obtain wool from a sheep.

Deal nine hearts of damage in a single hit.