Here is the full list of all 40 Goosebumps: The Game achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Grab every item you possibly can.
Finish the game in # turns or fewer.
Take pictures of every monster possible using the Haunted Camera.
Gather all possible items dropped from the laundry chute.
Complete the game without ever using the cell phone.
Defeat Slappy while wearing the Haunted Mask.
Complete the game after draining your phone to 0% battery.
Toss 10 expendable items into a deep, dark hole.
Pry the Haunted Mask off your face.
Have your life ended in 10 unique ways.
Track down RL Stine in the phone book and give him a call.
Use modern technology to give the second Ghost Child his heart's desire.
Discover Slappy's secret shame.
Recreate a crime scene to get security off your scent.
Achieve a perfect game of skeeball.
Find a way to call RL Stine without touching gross coins or a dirty phone receiver.
Be proactive and start your laundry.
Charge your cell phone.
Survive a power outage with gnome complications.
Tell Aunt Dahlia about your weekend plans.
Correctly answer a riddle as if your life depended on it.
Access the mysterious dimension from every possible angle.
Survive the game to completion.
Find entry into the bookstore.
Find a way inside the Mall.
Convince your brother to give you a ride across town.
Look into an antique mirror and do some self reflection.
Disable a deadly toy bent on destruction.
Solve a compression problem to reach the attic.
Take a photograph using the Haunted Camera.
See to the needs of the 3 unexpected guests.
Place the Magician's Top Hat on its rightful owner.
Intimidate a very deadly creature.
Narrowly escape defeat by wearing a talisman into the woods.
Evict an elderly intruder.
Face what lies beneath the sink... and survive!
Complete Area 1 and return home.
Find a way past the strange man in the woods.
Collect the cell phone from your school locker.