is it easy to open last unnamed/hidden achievements ...no idea what will trigger em...but i havenot done adate with mom yet ...so maybe smething will pop up
....eh museum date preparation is confusing...cannot get ingredients and candles...
General achievement #16? Yes, it's quite simple, actually.
Complete all of the other achievements (which includes all of the other endings for Claire, Veronica, Pam, Emma and Ashley), unlock all of the items in the gallery (that includes all images, scenes, videos and collectables) and you need to have Claire's suspicion and Ashley's jealousy stats at 5 each. These can get raised by pairing up with Veronica and Claire during the group yoga session on Saturday mornings on the rooftop at 8. But again, you'll need to be at a relationship level (100/100) with at least Claire and Veronica.
The ingredients for the dinner at home with Claire are at the supermarket. When you go there, you should see a bag of groceries. That's what you'll need for the "romantic evening" (seen in the notes on your phone). Finding the candles will trigger as soon as you enter the kitchen after you have everything else on the list.