Complete the game on 'Casual' or 'Experienced' difficulty.
Complete the game on 'Professional' difficulty.
Slam dunk a ghost into a trap.
Trap a ghost using the Slime Tether.
Trap a ghost using the Stasis Stream.
Trap a ghost.
Eliminate a creature.
Purchase all upgrades for the Proton Gun.
Purchase all upgrades for the Slime Gun.
Purchase all upgrades for the Dark Matter Generator.
Purchase all upgrades for the Meson Collider.
Purchase all available equipment upgrades.
Complete the the game with more than $3,000,000 in property damage.
Complete the the game with less than $100,000 in property damage.
Collect a Cursed Artifact.
Collect all Cursed Artifacts.
Obtain a 100% PKE scan on a paranormal creature.
Obtain 100% PKE scans for every paranormal creature.
Revive your teammates 20 times.
Get slimed by a charging ghost.
Knock yourself down with your own weapon.
Slide down the fire pole.
Use the Slime Tether on 15 ghosts.
Recover 20 of your own full ghost traps.
Remedy a dubious food choice to make the bar mitzvah as orthodox as it can be.
The tidy arcitectural office could use some Proton-based humbling.
The children's reading room has a story to tell, but it will take more than your eyes to see it.
Keep your ears open to learn everything you can about the Civil War.
Some ghosts had a real blowout in the Coat Room. Clean it up?
The hedge maze is a real eyesore; do some Protonic pruning.
Airborne coffins are an affront to gravity; use your Proton Pack to avenge Mother Nature!
Quench your thirst wherever possible to avoid being scared spitless.