In Avatar Battles, you can battle others as an avatar―a self outside of your self. Go there, and experience all that such combat has to offer.

Complete the Tutorial. (Can be achieved even if Tutorial is skipped.)

Cleared all missions with an S Rank rating.

Obtained all inner parts.

Craft and place a Flower Pot.

Destroy 3 machines without taking damage.

Deal nine hearts of damage in a single hit.

Use a Grindstone to get experience from an enchanted item.

Defeat an Evoker.

Trigger a Pillager Raid.

Play for 100 days.

Throw diamonds at another player.