If you ask Lin about Lisa's suitcase, a note will appear in the kitchen with a fiendish puzzle containing the code... If you get stuck, you can try asking various girls about the puzzle and their input ranges from insightful, but not useful all the way up to instantly solving it for you.
Nunu
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The continuation of the Carla scene there requires her to be pregnant.
I believe the Lin and Carla at the lake scene was just some poor coding (I should really stop coding at 4am) and will be fixed for the next release.
The Lisa challenge will require some help from Lin
As for Lisa, I think the part your missing is that you can get the altered note corruption. This will let you access her suitcase immediately without having to do the entire sidequest. Winning / Losing at poker is determined by whether you cheat.
Answering tit's requires about 8 head trauma or so
I'll investigate that last one
The Alex fixes Sami event is one hell of a nook. This one is related to following the left hand side of the follow up event when Carla sneaks in. It is definitely a bug in the description because it's missing a condition, which is to not cum inside Alex at another point in the reunion.
This one also has a bugged description It's from hypnotising Jenny to have larger breasts and not Lina.
The Haily one is limited to C4, as she has a different one for C5. Another showing of my poor explanations.
Tity monster may require moving Alex down some levels. I know a boobjob in the forest can bring up the titty monster. Then you can do battle again after dinner when hanging out with Alex in your room.
These other achievements, one requires some in depth exploration of the forest. The others aren't actually in the loop, instead they are in the orrery between runs.