Heart&Flower icons are obvious. For flower you need different girl forms for each monster-girl. For heart you may need to have musterbation&penetration skills on you to trigger some h scene.
Locked icon means you have to progress through story or side story first. Ex. You can only get the yukihime girl 3rd h scene after you kill the sidequest ice-boss first.
For bosses most of them just require you to deal some damage on them first.
Dot icon means that specific monster girl doesn't have that certain h scene. Ex. "heart dot" means you can only get the 2nd h scene out of her but not the 1st one.
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Buggy ones are...
Succubuss. The icons show that she has 3 h scene but in the gallery she only has 1 h scene.
The floating gem thingy. The icons show that she has 1 h scene but in the gallery she has no h scene.
Black-slime girl. The icons show that you can get any h scene from her on any location but in reallity it can only trigger here and the final area of the game.
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Ask here if you have trouble finding or trigger a specific ones. (I'm too lazy to make a full list...)
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Every item found. There is no ??? left on the map. Yet i'm still missing 2 room tickets.
(All coins all costumes...you get the pic.)