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