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

Breed two cows with wheat.

Play for 100 days.

Ring the bell with a hostile enemy in the village.

Befriend five wolves.

Craft and place a sign.

Use the Totem of Undying to cheat death.

Place four Sea Pickles in one block.

Find an underwater ruin.

Tame a Horse.

Dye your bed a different color.

Construct one type of each tool (one pickaxe, one spade, one axe and one hoe).

Acquire diamonds with your iron tools.