Monster 65 is Gohouken, you need the Guardian Wheel Monster Ticket. I believe it may be the one you get by going to the basement of one of the buildings in the knight residential area after doing the bar job, but I'm not sure. Number 80 is Antikon. You need to Deep World Amagawa, and the item needed is on that one place of the cutscene after beating the final boss (go back to the boss area, climb the ladder and you'll see it shining.
Edit: According to another post in this thread, you get the Guardian Wheel ticket by Deep Worlding Zashiki.
H-scene 42 is Tentacle Production Machine. That's another one I'm not sure about, maybe you get it from losing to ramdom enemies on the Artificial Sun area.
Souvenir 27 you need to have Loveswim in your party and search one of the water spots in the Knight residential Area. 35 and 36 are from speaking to a certain NPC in the Knight HQ executive area and giving her some random drops from the area. Souvenir 42 you need to buy in the Adventurer's resting area. I think it's on a side counter instead of a main one. 43 is from giving the fragment of Pufiru's Armor you can find in the area of the fight to an NPC in the same area as the one from 35 and 36. 45 you need to get a Kunoichi Ticket from the Kunoichi Game in the hot springs and give it to an NPC at the adventurer's resting area.