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