Here is the full list of all 49 99 Spirits achievements.
For Those Who Saw It All
Receive the Spirits' Blessing
"Acquire" a Mystical Item
Index All Tsukumogami
Free the World from Evil Influence
Vanquish all Great Monsters that Roam the Land
Walk a Tranquil Path
Reach Level 50
Walk the Path of Asura
Reach Level 40
For Those Who Reached the End
Vanquish a Great Monster
Complete Chapter Eleven
Reach Level 30
Amass a Fortune of 100.000
Get to Know the Merchant
Complete Chapter Ten
Get to Know the Monk
Complete Chapter Nine
Save a Damsel in Distress
Win 500 in a Single Gamble
Show Proof of Mastering the Use of Gems
Travel 5000 Steps
Pay Your Respects
Complete Chapter Eight
Reach Level 20
Complete Chapter Seven
Maximum Utility, No Nonsense
Complete Chapter Six
Free an Area from Evil Influence
Master a Tsukumogami
Complete Chapter Five
Win a Gamble
Complete Chapter Four
Win 100 Battles
Amass a Fortune of 20.000
Find All Stone Statues in a Single Playthrough
Reach Level 10
Complete Chapter Three
Sell 50 Items
Running Is a Victory
Identify an Enemy Without Any Hints
Complete Chapter Two
For Big Eaters
Complete Chapter One
Defeat the First Boss Without Using Items
Learn All You Can Before Setting Out
Win a Battle Without Missing a Single Counter
Wake up Dozing Hanabusa