If I have to get all 5 relationship bars to 150, it'll take quite some time. And since the achievement says I have to do it within the first 24 days, it leaves me with few options. Thats why I asked for a strategy of sorts.
If you do truly know how to mate with all of them before day 24 tho I'd love to hear it, you said you can do it in a single day but not how. (I could easily be missing something)
If I can use the gallery to get it (idk how that would work) then I can do that tho.