Kill a skeleton with an arrow from more than 50 meters.

Gather all 16 colours of Wool.

Swim in lava while having the Fire Resistance effect.

Stop starvation using Rotten Flesh.

Use a saddle to ride a pig, then have the pig get hurt from fall damage while riding it.

Play a music disc in a Jukebox.

Build some bookshelves to improve your enchantment table.

Discover 17 of 40 biomes.

Craft and place a Flower Pot.

Craft and place a Sign.

Attack and destroy a monster.

Wear a full suit of Iron Armour.