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