I have already done that. Mating with them all in one day does not trigger the achievement. The wording suggests it has to be done withing the first 24 days (before the first summer) I just can't imagine that being possible.
But is this really the best solution? For example, I have already lost this achievement, counting Mai's arrival and several years of life
I'm looking for any solution that does not involve using the console tbh, I just don't know how to do it.
