Use a Grindstone to get experience from an enchanted item.

Befriend five wolves.

Acquire 30 Emeralds by trading with villagers or mining.

Why don't you try finishing up the tutorial? You might've mastered the first step, but nailing down the fundamentals is what's important.

Visit all Nether biomes [Bedrock Only]

Throw diamonds at another player.

Wear a full suit of Iron armour.

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

Play for 100 days.

Tame a Horse.

Kill a Pillager Captain.

Visit all Ocean Biomes.