Here is the full list of all 27 NEKOPARA Vol. 3 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Bouncy, bouncy~
Clear Chapter 15
Clear Chapter 14
Clear Chapter 13
Clear Chapter 12
Clear Chapter 11
Clear Chapter 10
Clear Chapter 9
Clear Chapter 8
Clear Chapter 7
Clear Chapter 6
Clear Chapter 5
Clear Chapter 4
Clear Chapter 3
Clear Chapter 2
Petted Chocola
Petted Vanilla
Clear Chapter 1
Petted Cinnamon
Petted Maple
Petted Shigure
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Petted Coconut
Petted Azuki
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Try playing it in Japanese!