Tame a Horse.

Stay underwater for 2 minutes.

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

Eat a Notch Apple.

Destroy a Ghast with a fireball.

Throw diamonds at another player.

Free fall from the top of the world (build limit) to the bottom of the world and survive

Use a hopper to move an item from a chest minecart to a chest. [Bedrock Only]

Slide down a honey block to slow your fall. [Bedrock Only]

Wear a full set of Netherite armor [Bedrock Only]

Use the Totem of Undying to cheat death.

Defeat an Elder Guardian.

Kill a Mob while wearing the same type of Mob Head.