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