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