Use planks and sticks to make a hoe.

Discover a Shipwreck.

Poison a Witch with a Splash Potion.

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

Play a music disc in a Jukebox.

Name a Shulker Box with an Anvil.

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

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]

Have all 3 froglights in your inventory

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

Use the Totem of Undying to cheat death.