Feed a dolphin raw cod and have it lure you to treasure.

Trade with a villager at the build height limit

Activate a Conduit.

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

Using the Frost Walker boots, walk on at least 1 block on frozen water on a deep ocean.

Defeat an Elder Guardian.

Dry a Sponge in a Furnace.

Respawn the Enderdragon.

Name a Shulker Box with an Anvil.

Poison a Witch with a Splash Potion.

Breed two Pandas with Bamboo.

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

Stay underwater for 2 minutes.