Complete each achievement to get the allotted gamerscore.

Unlockables

...And You Want to Keep It? (20) Collect a Cursed Artifact.
Aim for the Flat Top! (10) Eliminate a creature.
Are You A God? (100) Complete the game on 'Professional' difficulty.
Back Off Man. I'm a Scientist (40) Obtain 100% PKE scans for every paranormal creature.
But the Kids Love Us! (20) The children's reading room has a story to tell, but it will take more than your eyes to see it.
Disaster of Biblical Proportions (20) Complete the 'Central Park Cemetery' level.
Egon's Guinea Pig (10) Use one of every pickup (both power-ups and equipment).
Employee of the Month (10) Be top earner in each Xbox LIVE job type.
Get Her! (20) Complete the 'Checking Out the Library' level.
Ghost Fever Grips New York (20) Complete the 'Museum of (Super)Natural History' level.
Ghostbusters Drinking Game (40) Quench your thirst wherever possible to avoid being scared spitless.
Gozer's Most Wanted (15) Successfully complete each Xbox LIVE job in every location.
Heat 'Em Up (20) Purchase all upgrades for the Proton Gun.
Hedgebuster (10) The hedge maze is a real eyesore; do some Protonic pruning.
I Ain't 'Fraid of No Ghost! (10) Trap a ghost.
I Don't Want My Face Burned Off (20) Purchase all upgrades for the Meson Collider.
I Feel So Funky (5) Get slimed by a charging ghost.
I Looked at the Trap, Ray! (20) Recover 20 of your own full ghost traps.
I Love You When You Rough-House! (10) The tidy arcitectural office could use some Proton-based humbling.
I'm a Ghostbuster, Not a Doctor! (20) Revive your teammates 20 times.
I'm Picking Up A Signal... (20) Obtain a 100% PKE scan on a paranormal creature.
I've Quit Better Jobs Than This. (20) Some ghosts had a real blowout in the Coat Room. Clean it up?
It's a Living (10) Trap over 50 ghosts in your Xbox LIVE Ghostbusting career.
It's Slime Time (20) Use the Slime Tether on 15 ghosts.
Kosher! (10) Remedy a dubious food choice to make the bar mitzvah as orthodox as it can be.
Let Me Guess, Gozer Worshippers (20) Complete the 'Lost Island Rising' level.
Loans Paid Off (10) More than $100,000 earned in Xbox LIVE.
Mother Pus Bucket! (20) Purchase all upgrades for the Slime Gun.
Nice Shootin', Tex! (30) Complete the game with less than $100,000 in property damage.
No Job Too Big (10) Defeat all Most Wanted Ghosts.
On the Payroll (10) Successfully complete one Xbox LIVE campaign.
Once S'more into the Breach (20) Complete the 'Panic in Times Square' level.
One down, on the Ground! (20) Airborne coffins are an affront to gravity; use your Proton Pack to avenge Mother Nature!
Overachiever (15) Get over $2,500,000 in Xbox LIVE, over 30 post-job awards, 50 jobs completed.
Payday! (10) Be the overall top earner in each Xbox LIVE campaign setting.
Slam Dunk! (15) Slam dunk a ghost into a trap.
Slime Dunk! (15) Trap a ghost using the Slime Tether.
Somebody Saw a Cockroach on 12 (20) Complete the 'Return to the Sedgewick' level.
Spores, Molds, and Fungus (40) Collect all Cursed Artifacts.
Stasis Dunk! (15) Trap a ghost using the Stasis Stream.
The Destructor (30) Complete the game with more than $3,000,000 in property damage.
The Flowers are Still Standing! (20) Complete the 'Welcome to the Hotel Sedgewick' level.
Total Protonic Reversal (5) Knock yourself down with your own weapon.
Wanted! (10) Defeat three Most Wanted Ghosts.
We be fast! They be slow! (20) Purchase all upgrades for the Dark Matter Generator.
We Came, We Saw... (50) Complete the game on 'Casual' or 'Experienced' difficulty.
We Have the Talent! (20) Complete the Firehouse training level.
We Have the Tools! (40) Purchase all available equipment upgrades.
You Gotta Try This Pole! (5) Slide down the fire pole.
You Never Studied (10) Keep your ears open to learn everything you can about the Civil War.