Serrated Knife and Small Macaron
In your house drawer thingy
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Big Liar and Dragon Aura
In Carol's house drawer
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Legendary weapons
In between the house and the lamp
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Serrated Knife and Small Tart
In the bookshelf of your room
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Big Liar and Dragon Aura
Found in Lucas's room in the right bookshelf
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Legendary Weapons
Facing to the right to this plants/bush

Serrated Knife and Small Donut
In the trash can of the first room to the right of the second floor
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Big Liar and Dragon Aura
In the trash can of the second room to the right on the second floor
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Legendary Weapons
Found in the same room as Big liar and Dragon Aura instead its in the corner to the bottom left
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Funny Glasses
Can only be found at the start of the game by going to the second floor to the left before the whole place turn into ♥♥♥♥ ________________________________________________________________

Maid Outfit
You can get it during the Maid Investigation part of the story when you check the wardrobe after showing the purple haired maid the medicines

If you have any questions about achievements just ask in the comment