Here is the full list of all 23 The Shape of Things achievements.
Complete all shapes from the "Underwater-Reef, Seashore, Fishing Boat" gacha
Complete all shapes from the "Market Street & Candy Shop" gacha
Complete all shapes from "Flower Field", "Pond", "Camping" gacha
Obtain 30 gacha
Complete all pieces from the "Magic Room & Old Ruins" gacha
Spend 5 minutes enjoying time in your room
Complete all pieces from the "Art Studio, Classroom" gacha
Reset a shape 5 times
Complete all shapes from the "Arcade & Gamer Room" gacha
Solve 100 unique shapes
Obtain 10 gacha
Complete 75 Shapes
Complete 10 shapes from the same world in less than 10 minutes
Complete 50 shapes
Obtain 5 gacha!
Complete 25 shapes
Solve one shape in less than 30 seconds
Change the mood to a snowy morning
Change the mood to a sunset
Change the mood to a rainy night
Complete your first shape
Obtain your first gacha!
Spend less than 10 seconds to solve one shape