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