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