Befriend twenty stray Cats.

Use a Campfire to collect Honey from a Beehive using a Bottle without aggravating the bees. [Bedrock Only]

Catch and cook a fish!

Kill the Enderdragon.

Enter an End Portal.

Eat a Notch Apple.

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

Smelt wood trunks using charcoal to make more charcoal.

Teleport over 100 meters from a single throw of an Ender Pearl.

Craft and place a Flower Pot.

Throw diamonds at another player.

Dig up a buried treasure. [Bedrock Only]