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.
Complete the game without ever using the cell phone.
Track down RL Stine in the phone book and give him a call.
Take pictures of every monster possible using the Haunted Camera.
Pry the Haunted Mask off your face.
Be proactive and start your laundry.
Tell Aunt Dahlia about your weekend plans.
Defeat Slappy while wearing the Haunted Mask.
Toss 10 expendable items into a deep, dark hole.
Gather all possible items dropped from the laundry chute.
Disable a deadly toy bent on destruction.
Recreate a crime scene to get security off your scent.
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.
Correctly answer a riddle as if your life depended on it.
Have your life ended in 10 unique ways.
Charge your cell phone.
Achieve a perfect game of skeeball.
Find entry into the bookstore.
Survive a power outage with gnome complications.
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.
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.
Use modern technology to give the second Ghost Child his heart's desire.
Place the Magician's Top Hat on its rightful owner.
Take a photograph using the Haunted Camera.
Evict an elderly intruder.
Face what lies beneath the sink... and survive!
Intimidate a very deadly creature.
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.