Here is the full list of all 25 The Cat Lady achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Unlock the secret "golden ending".
Prevent Mitzi from killing The Eye of Adam in Chapter 7.
Keep your cool throughout Chapter 3.
Stand up to Bryan in Chapter 3.
Use the mace to kill Doctor X in Chapter 2.
Disregard the Queen of Maggots in Chapter 1.
Kill The Eye of Adam yourself in Chapter 7.
Buy time for Jesse in Chapter 6.
Hold tight to your gas mask in Chapter 7.
Complete the final chapter.
Let Mitzi kill The Eye of Adam in Chapter 7.
Complete the sixth chapter.
Give up your gas mask in Chapter 7.
Complete the fifth chapter.
Choose your words carefully in Chapter 5.
Complete the fourth chapter.
Stay away from Gladys' cleaver in Chapter 4.
Don't give up on the foggy orchard in Chapter 4.
Complete the third chapter.
Complete the second chapter.
Use the spear to kill Doctor X in Chapter 2.
Solve Crow's riddle in Chapter 2.
Answer Liz's questions correctly in Chapter 2.
Complete the first chapter.
Trust the Queen of Maggots in Chapter 1.