Breed two cows with wheat.

Use Shears to obtain wool from a Sheep.

Acquire diamonds with your iron tools.

Kill a creeper with Arrows.

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

Smelt an iron ingot.

Swim in lava while having the Fire Resistance effect.

Harvest some leather.

Bake a cake using wheat, sugar, milk and eggs!

Wear a full suit of Iron Armour.

Cook and eat a pork chop.

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.