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