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.
Take pictures of every monster possible using the Haunted Camera.
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.
Discover Slappy's secret shame.
Grab every item you possibly can.
Pry the Haunted Mask off your face.
Have your life ended in 10 unique ways.
Toss 10 expendable items into a deep, dark hole.
Gather all possible items dropped from the laundry chute.
Be proactive and start your laundry.
Take a photograph using the Haunted Camera.
Finish the game in # turns or fewer.
Tell Aunt Dahlia about your weekend plans.
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.
Survive the game to completion.
Find entry into the bookstore.
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.
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.
Narrowly escape defeat by wearing a talisman into the woods.
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.
Face what lies beneath the sink... and survive!
Evict an elderly intruder.
Complete Area 1 and return home.
Place the Magician's Top Hat on its rightful owner.
Find a way past the strange man in the woods.
Collect the cell phone from your school locker.