Kill the Enderdragon.

Enter an End Portal.

Stay underwater for 2 minutes.

Stop starvation using Rotten Flesh.

Place four Sea Pickles in one block.

Deal nine hearts of damage in a single hit.

Relieve a Blaze of its rod.

Breed two cows with wheat.

Trade for the best possible price.

Dye all 4 unique pieces of Leather Armor.

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

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

Play a music disc in a Jukebox.