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 Panther
Hire a Fox
Hire a Phonix
Hire a Weasel
Hire a Gaben
Hire a Penguin
Hire a Black Cat
Hire a Golden Dog
Hire an Oni
Hire a Turtle
Unlock Mission 16
Unlock Mission 15
Unlock Mission 14
Hire a Monkey
Hire a Fish
Hire a Crown
Unlock Mission 13
Unlock Mission 12
Unlock Mission 11
Hire a Cat
Unlock Mission 10
Unlock Mission 9
Unlock Mission 8
Hire a Sorrow
Unlock Mission 7
Unlock Mission 6
Unlock Mission 5
Unlock Mission 4
Unlock Mission 3
Unlock Mission 2
Hire a Dog
Unlock Mission 1