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