Use a Campfire to collect Honey from a Beehive using a Bottle without aggravating the bees.
Freefall from the top of the world (build limit) to the bottom of the world and survive.
Travel by minecart to a point a least 500m in a single direction from where you started.
Use a saddle to ride a pig, and then have the pig get hurt from fall damage while riding it.
Using the Frost Walker boots, walk on at least 1 block on frozen water on a deep ocean