Deal nine hearts of damage in a single hit.

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

Harvest some leather.

Place four Sea Pickles in one block.

Activate a Conduit.

Swim in lava while having the Fire Resistance effect.

Stop starvation using Rotten Flesh.

Tame an Ocelot.

Catch and cook a fish!

Craft and place a Sign.

Smelt Wood Trunks using Charcoal to make more Charcoal.

Construct a better pickaxe.