Here is the full list of all 24 Neko Secret - Homecoming achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Find the darts minigame and play it!
Try character editor
Complete the art #6 from the second collection
Complete the art #5 from the second collection
Complete the art #4 from the second collection
Complete the art #3 from the second collection
Complete the art #2 from the second collection
Complete the art #1 from the second collection
Complete the art #6 from the first collection
Complete the art #5 from the first collection
Complete the art #4 from the first collection
Complete the art #3 from the first collection
Complete the art #2 from the first collection
Complete the art #1 from the first collection
Open the anime factory computer
Enter the right code of the anime factory door
Find and open the safe #6
Find and open the safe #8
Find and open the safe #7
Find and open the safe #2
Find and open the safe #1
Find and open the safe #3
Find and open the safe #4
Find and open the safe #5