Here is the full list of all 41 Akaneiro: Demon Hunters achievements.
Unlock Mission 1
Unlock Mission 2
Unlock Mission 3
Unlock Mission 4
Unlock Mission 5
Unlock Mission 6
Unlock Mission 7
Unlock Mission 8
Unlock Mission 9
Unlock Mission 10
Unlock Mission 11
Unlock Mission 12
Unlock Mission 13
Unlock Mission 14
Unlock Mission 15
Unlock Mission 16
Unlock Mission 17
Unlock Mission 18
Unlock Mission 20
Unlock Mission 21
Unlock Mission 22
Unlock Mission 23
Unlock Mission 25
Unlock Mission 26
Unlock Mission 28
Hire a Dog
Hire a Cat
Hire a Crown
Hire a Fish
Hire a Monkey
Hire a Turtle
Hire an Oni
Hire a Golden Dog
Hire a Black Cat
Hire a Penguin
Hire a Gaben
Hire a Weasel
Hire a Phonix
Hire a Fox
Hire a Panther
Hire a Sorrow