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