When you have collected the indicated amount of Samurai Points by clearing playthroughs in the game the corresponding accessory will become available.

Unlock Afro Hair (Black):
Collect 1400 Samurai Points

Unlock Anachronistic Glasses:
Collect 6600 Samurai Points

Unlock Angel Wings (White):
Collect 5400 Samurai Points

Unlock Cat Boot (L):
Collect 7800 Samurai Points

Unlock Cat Boot (R):
Collect 7600 Samurai Points

Unlock Cat Ears (Black):
Collect 8300 Samurai Points

Unlock Cat Glove (L):
Collect 7400 Samurai Points

Unlock Cat Glove (R):
Collect 7200 Samurai Points

Unlock Cat Tail:
Collect 8000 Samurai Points

Unlock Crazy hair (Black):
Collect 4800 Samurai Points

Unlock Demon Horns (White):
Collect 8900 Samurai Points

Unlock Demon Tail:
Collect 9600 Samurai Points

Unlock Demon Wings:
Collect 9200 Samurai Points

Unlock Futuristic Glasses (White):
Collect 3600 Samurai Points

Unlock Halo:
Collect 5800 Samurai Points

Unlock Mamuru Charm:
Collect 4600 Samurai Points

Unlock Mask:
Collect 2400 Samurai Points

Unlock Store Sign:
Collect 400 Samurai Points

Unlock Swan Toy:
Collect 2800 Samurai Points

Unlock Tiara:
Collect 3000 Samurai Points

Unlock Tribal Earrings:
Collect 3800 Samurai Points

Unlock White Falcon:
Collect 1800 Samurai Points