Here is the full list of all 15 Milk Bottle And Monster Girl 2 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Monster Girl 15
Monster Girl 14
Monster Girl 13
Monster Girl 12
Monster Girl 11
Monster Girl 10
Monster Girl 9
Monster Girl 8
Monster Girl 7
Monster Girl 6
Monster Girl 5
Monster Girl 4
Monster Girl 3
Monster Girl 2
Monster Girl 1