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