Have a Doctor enter the cage to check out a cut.

Use a Guard Breaking strike to break your opponents block.

Start your Contender Series Training Camp in Career Mode.

Release a Submission to advance your position.

Upgrade a move during a fight or training in Career Mode.

Complete all Tales of Iki.

Purchase an item from the Crimson Dye Merchant and obtain a dye for your Sakai Horse Armor.

Achieve bronze or higher on all Archery Challenges.

Complete all Haiku, Onsen, Shinto Shrines, and Bamboo Strikes on Iki Island.

Defeat N. Tropy.

Discover a Death Route.

Defeat Tiny Tiger.

Just "forget" it. Repeatedly.