Dry a Sponge in a Furnace.

Place 9 fully explored, adjacent Maps into 9 Item Frames in a 3 by 3 square.

Defeat an Elder Guardian.

Dye your bed a different color.

Swim in lava while having the Fire Resistance effect.

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

Place four Sea Pickles in one block.

Activate a Conduit.

Breed two Pandas with Bamboo.

Name a Shulker Box with an Anvil.

Use Riptide to give yourself a boost.

Discover a Shipwreck.