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