Full list of all 99 Scream Collector achievements. It takes around 200 hours to unlock all of the achievements in the base game on Windows.
The base game contains 79 achievements, and there is 1 DLC pack containing 20 achievements.
Click on the toilet 300K times
Activate the Click Bonus 1000 Times In The Bathroom
Activate the Creep Bonus 1000 Times In The Bathroom
Activate the Speed Bonus 1000 Times In The Bathroom
Play Pipes 250 Times in the Bunker
Find 1000 Hidden Objects In The Bathroom
Bathroom Progress
Make 10K Sounds In The Bathroom
Empty the TP Roll 250 Times
Earn 2.5 Trillion Halloween Spirits In The Bathroom
Find 250 Bath Toys
Use a Bath Bomb of Each Color
Use 100 Bottles in the Bathroom
Summon Mary 50 Times
Defeat the Toilet 100 Times
Clean 100 Bloody Hands
Hit 25 Skeletons
Whack 250 Sink Squids
Reveal the Piggy 50 Times
Feed the Toilet 50 Times