Here is the full list of all 12 Our Journeys 3 ~ A Collection of Visual Novels achievements.
The witch is here
Gotta watch out for him
Complete "Witch Shirina"
All Alone
Slave of the Cursed Queen
Complete "Denis vs Dark Fairies" with the good ending
Complete Chapter 1
Complete Chapter 2
Complete Chapter 3
Complete Chapter 4
Complete Chapter 5
Complete Chapter 6 and "A.L.A.N."