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.
Complete the game without ever using the cell phone.
Grab every item you possibly can.
Have your life ended in 10 unique ways.
Take pictures of every monster possible using the Haunted Camera.
Track down RL Stine in the phone book and give him a call.
Finish the game in # turns or fewer.
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.
Recreate a crime scene to get security off your scent.
Achieve a perfect game of skeeball.
Survive a power outage with gnome complications.
Toss 10 expendable items into a deep, dark hole.
Pry the Haunted Mask off your face.
Defeat Slappy while wearing the Haunted Mask.
Survive the game to completion.
Complete the game after draining your phone to 0% battery.
Discover Slappy's secret shame.
Find a way to call RL Stine without touching gross coins or a dirty phone receiver.
Find entry into the bookstore.
Correctly answer a riddle as if your life depended on it.
Charge your cell phone.
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.
Gather all possible items dropped from the laundry chute.
Be proactive and start your laundry.
See to the needs of the 3 unexpected guests.
Disable a deadly toy bent on destruction.
Evict an elderly intruder.
Take a photograph using the Haunted Camera.
Face what lies beneath the sink... and survive!
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.