Use the Totem of Undying to cheat death.

Spawn the Wither.

Craft a Banner using an Enchanted Apple.

Make a decorated pot out of 4 pottery shards

Use Riptide to give yourself a boost.

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

Poison a Witch with a Splash Potion.

Push a piston with a piston, then pull the original piston with that piston. [Bedrock Only]

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

Trim with all the following smithing templates at least once: Spire, Snout, Rib, Ward, Silence, Vex, Tide and Wayfinder.

Destroy a Ghast with a fireball.

Create an Iron Golem.