Breed two cows with wheat.

Smelt wood trunks using charcoal to make more charcoal.

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

In Die Maschine, craft 14 different types of items in one match.

Throw diamonds at another player.

Harvest some leather.

Acquire diamonds with your iron tools.

Stop starvation using Rotten Flesh.

Kill a creeper with arrows.

Smelt an iron ingot.

Wear a full suit of Iron armour.

Construct a better pickaxe.