For the rest of Tsuyu, you have to choose to blackmail her when asked.
For Ochako, yeah a screenshot would be nice, the one for the 4th scene is supposed to happen right after the 3rd.
Unfortunately all of these need you to replay the game if you don't have the save file at the correct point.
The Ochaco ones, you unlock by bringing Ochaco into the cave lab with you during Mei's quest. It's weird that you unlocked the Tsuyu scene there but not Ochaco, lol.
For Tsuyu, the answer is in my previous post.