Kill the Enderdragon.

Travel by minecart to a point at least 500m in a single direction from where you started.

Acquire 30 Emeralds by trading with villagers or mining.

Cure a zombie villager.

Wear a full suit of Iron armour.

Gain the trust of an Ocelot.

Mine 1,728 Cobblestone and place it in a chest.

Gather all 16 colours of wool.

Use Shears to obtain wool from a sheep.

Breed two cows with wheat.

Build some bookshelves to improve your enchantment table.

Kill a creeper with arrows.

Relieve a Blaze of its rod.