Swim in lava while having the Fire Resistance effect.

Ring the bell with a hostile enemy in the village.

Use a Grindstone to get experience from an enchanted item.

Use planks and sticks to make a sword.

Turn wheat into bread.

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

Destroy a Ghast with a fireball.

Construct an Enchantment Table.

Build some bookshelves to improve your enchantment table.

Stay underwater for 2 minutes.

Dig up a buried treasure. [Bedrock Only]

Find an underwater ruin.

Wear a full suit of Iron armour.