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