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