Use an Elytra to fly through a 1 by 1 gap while moving faster than 40 m/s.

Eat a Notch Apple.

Dry a Sponge in a Furnace.

Tame a Horse.

Wear a full suit of Iron Armour.

Play a music disc in a Jukebox.

Swim in lava while having the Fire Resistance effect.

Craft and place a Flower Pot.

Cure a Zombie Villager.

Dye your bed a different color.

Kill a creeper with Arrows.

Build some bookshelves to improve your enchantment table.

Brew a potion.