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