There is no guide for this game yet. But apparently it is EASY POINTS! 

A Secret History - 10 points

Complete "THE DAIMYO'S STORY"

The Death of Innocence - 15 points

Complete "SCHOOL INVASION"

The Price for Vengeance - 20 points

Complete "SWORD MASTER'S STORY"

Love Lost - 25 points

Complete "OKIKU'S STORY"

The Path to Godhood - 30 points

Complete "THE LOWDOWN EAST PASS"

And so it begins - 5 points

Complete "PRELUDE"

Copy-Cat Killer - 35 points

Complete "THE DOPPELGANGER"

The Past Laid to Rest - 40 points

Complete "KUMA'S STORY"

All That Stood Are Gone - 45 points

Complete "THE EMPTY SEVEN'S STORY"

Revenge Served? - 50 points

Complete "JUSTICE'S STORY"

Completionist - 200 points

Complete the game on both difficulties

Closer to God - 5 points

Slice an enemy using a Vertical Attack with a bonus

This Little Piggy - 10 points

Slice off fingers and toes at the same time

Give Me a Hand - 10 points

Slice off an enemy's hand

Two Birds One Sword - 5 points

Slice 2 enemies at once

Three-way - 5 points

Slice 3 enemies at once

Four to the Floor - 10 points

Slice 4 enemies at once

The Child Without a Name - 5 points

Collect 5 mementos in "THE DAIMYO'S STORY"

Afro Samurai - 5 points

Collect 5 mementos in "SCHOOL INVASION"

The Demon of Vengeance - 5 points

Collect 5 mementos in "OKIKU'S STORY"

The Number Two - 5 points

Collect 5 mementos in "THE LOWDOWN EAST PASS"

The Death Bringer - 5 points

Collect 5 mementos in "THE DOPPELGANGER"

Widow Maker - 5 points

Collect 5 mementos in "KUMA'S STORY"

The Samurai Ghost - 5 points

Collect 5 mementos in "THE EMPTY SEVEN'S STORY"

The Number One - 100 points

Unlock all skills

Hundred Head Hunter - 20 points

Slice off 100 heads with a bonus

Head to Toe - 25 points

Slice 50 enemies using a Vertical Attack with a bonus

Meijin - 5 points

Achieve 100 kills

Kengo - 20 points

Achieve 1000 kills

Kensei - 50 points

Achieve 2000 kills

Made Hand Ronin - 5 points

Complete a Ronin Straight Flush

No Limit Ninjas - 10 points

Complete a Ninja Straight Flush

Kunoichi Suicide Queens - 10 points

Complete a Kunoichi Straight Flush

Gutshot Android Straight - 15 points

Complete an Android Straight Flush

Off Suit Samurai - 25 points

Complete a Samurai Straight Flush

Hip Hop -10 points

Slice off an enemy's foot

Slow Your Roll - 5 points

Slice an enemy during their attack

You Are Glue -10 points

Kill an enemy with a sliced bullet

I Am Rubber - 10 points

Kill an enemy with a reflected bullet

Mash Medley - 5 points

Achieve a 20 hit combo

Rhythm Section - 20 points

Achieve a total of 3000 combos

Let It Flow - 15 points

Spill 2000 gallons of blood

Bushi - 30 points

Unlock 40 skills

Ashigaru - 10 points

Unlock 10 skills

Hatamoto - 20 points

Unlock 25 skills

F*!# Gravity - 5 points

Slice an enemy in the air

Hats Off to You - 5 points

Slice off a head with a bonus

Torso From Tail - 15 points

Slice 50 bellies