Create and fully power a Beacon.

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

Use the Totem of Undying to cheat death.

Eat nothing but Kelp for 3 days.

Construct an Enchantment Table.

Construct a furnace out of eight cobblestone blocks.

Create an Iron Golem.

Spawn the Wither.

Dry a Sponge in a Furnace.

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

Build a tower of Scaffolding that reaches the maximum build height.

Collect any fish in a bucket.

Throw diamonds at another player.