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