Use a Dried Kelp block as fuel in a furnace.

Acquire a map from a cartographer villager, then enter the revealed structure. [Bedrock Only]

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

Lead a caravan containing at least 5 Llamas.

Respawn the Enderdragon.

Punch a tree until the block of wood pops out.

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

Stay underwater for 2 minutes.

Kill the Wither.

Cook and eat rabbit meat. [Bedrock Only]

Eat a Notch Apple.

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

Tame a Horse.