Unlockables - Complete each achievement to get the allotted gamerscore.

A Secret History (10) Complete "THE DAIMYO'S STORY".
Afro Samurai (5) Collect 5 mementos in "SCHOOL INVASION".
All That Stood Are Gone (45) Complete "THE EMPTY SEVEN'S STORY".
And so it begins (5) Complete "PRELUDE".
Ashigaru (10) Unlock 10 skills.
Bushi (30) Unlock 40 skills.
Closer to God (5) Slice an enemy using a Vertical Attack with a bonus.
Completionist (200) Complete the game on both difficulties.
Copy-Cat Killer (35) Complete "THE DOPPELGANGER".
F*!# Gravity (5) Slice an enemy in the air.
Four to the Floor (10) Slice 4 enemies at once.
Give Me a Hand (10) Slice off an enemy's hand.
Gutshot Android Straight (15) Complete an Android Straight Flush.
Hatamoto (20) Unlock 25 skills.
Hats Off to You (5) Slice off a head with a bonus.
Head to Toe (25) Slice 50 enemies using a Vertical Attack with a bonus.
Hip Hop (10) Slice off an enemy's foot.
Hundred Head Hunter (20) Slice off 100 heads with a bonus.
I Am Rubber (10) Kill an enemy with a reflected bullet.
Kengo (20) Achieve 1000 kills.
Kensei (50) Achieve 2000 kills.
Kunoichi Suicide Queens (10) Complete a Kunoichi Straight Flush.
Let It Flow (15) Spill 2000 gallons of blood.
Love Lost (25) Complete "OKIKU'S STORY".
Made Hand Ronin (5) Complete a Ronin Straight Flush.
Mash Medley (5) Achieve a 20 hit combo.
Meijin (5) Achieve 100 kills.
No Limit Ninjas (10) Complete a Ninja Straight Flush.
Off Suit Samurai (25) Complete a Samurai Straight Flush.
Revenge Served? (50) Complete "JUSTICE'S STORY".
Rhythm Section (20) Achieve a total of 3000 combos.
Slow Your Roll (5) Slice an enemy during their attack.
The Child Without a Name (5) Collect 5 mementos in "THE DAIMYO'S STORY".
The Death Bringer (5) Collect 5 mementos in "THE DOPPELGANGER".
The Death of Innocence (15) Complete "SCHOOL INVASION".
The Demon of Vengeance (5) Collect 5 mementos in "OKIKU'S STORY".
The Number One (100) Unlock all skills.
The Number Two (5) Collect 5 mementos in "THE LOWDOWN EAST PASS".
The Past Laid to Rest (40) Complete "KUMA'S STORY".
The Path to Godhood (30) Complete "THE LOWDOWN EAST PASS".
The Price for Vengeance (20) Complete "SWORD MASTER'S STORY".
The Samurai Ghost (5) Collect 5 mementos in "THE EMPTY SEVEN'S STORY".
This Little Piggy (10) Slice off fingers and toes at the same time.
Three-way (5) Slice 3 enemies at once.
Torso From Tail (15) Slice 50 bellies.
Two Birds One Sword (5) Slice 2 enemies at once.
Widow Maker (5) Collect 5 mementos in "KUMA'S STORY".
You Are Glue (10) Kill an enemy with a sliced bullet.

Number One Difficulty - Beat the game on the default difficulty setting to unlock Number One difficulty.