Here is the full list of all 90 Milk Bottle And Monster Girl achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Monster Girl 15
Monster 75
Monster 74
Monster 73
Monster 72
Monster 71
Monster Girl 14
Monster 70
Monster 69
Monster 68
Monster 67
Monster 66
Monster Girl 13
Monster 65
Monster 64
Monster 62
Monster 63
Monster 61
Monster Girl 12
Monster 60
Monster 59
Monster 58
Monster 57
Monster 56
Monster Girl 11
Monster 55
Monster 54
Monster 53
Monster 52
Monster 51
Monster Girl 10
Monster 49
Monster 50
Monster 48
Monster 47
Monster 46
Monster Girl 9
Monster 45
Monster 44
Monster 43
Monster 42
Monster 41
Monster Girl 8
Monster 40
Monster 39
Monster 38
Monster 37
Monster 36
Monster Girl 7
Monster 10
Monster 9
Monster 8
Monster 7
Monster 6
Monster Girl 6
Monster 35
Monster 34
Monster 33
Monster 32
Monster 31
Monster Girl 5
Monster 30
Monster 29
Monster 27
Monster 28
Monster 26
Monster Girl 4
Monster 25
Monster 24
Monster 23
Monster 22
Monster 21
Monster Girl 3
Monster 20
Monster 19
Monster 18
Monster 17
Monster 16
Monster Girl 2
Monster 15
Monster 14
Monster 13
Monster 12
Monster 11
Monster Girl 1
Monster 5
Monster 4
Monster 3
Monster 2
Monster 1