...And You Want to Keep It?
Requirements: Acquire a cursed artifact.
Comments: You'll find more than 40 artifacts throughout the course of an entire singleplayer campaign, so you can accomplish this task very soon.
Aim for the Flat Top!
Requirements: Eliminate a hostile creature.
Comments: You can fulfill this assignment during your first stay in the Sedgewick hotel when you get rid of the first Candelabrium Crawler.
Are You A God?
Requirements: Finish the game on the highest difficulty setting.
Back Off Man. I'm a Scientist
Requirements: Scan all ghosts.
Comments: Remember that you can monitor your progress using the REPLAY MISSION function, because the game will inform you how many ghosts have you scanned. Check my main guide to find the locations of all the phantoms and remember that only full scans count.
But the Kids Love Us!
Requirements: Find out the secret of the children's study.
Comments: This challenge is tied directly to the third mission of the game (public library). Start off by reaching the study designed for children. You'll have to perform three activities here. Head on to your right. Approach the tree and use your PKE meter to scan a bear.
You must now explore the central area of the room. Examine the floor and it shouldn't take too long for you to find the drawing. Scan it with the meter.
Finally, proceed towards a door leading to the left room. Stand near the door and fire a single Boson Dart to unlock this passageway. Enter a small room and take a scan of a new toy. You'll receive this achievement soon after you've scanned the last object from the list.
Disaster of Biblical Proportions
Requirements: Finish the seventh level of the game (Central Park Cemetery)
Requirements: Finish the third level of the game (Public Library).
Ghost Fever Grips New York
Requirements: Finish the fourth level of the game (Museum of History)
Ghostbusters Drinking Game
Requirements: Drink water from eight fountains.
Location: This first fountain can be found next to the stairs leading to the basement.
2) Sedgewick Hotel
Location: You have to be in the lobby area. Check one of the side corridors near vending machines. You'll also find a cursed artifact nearby (possessed bell).
3) Sedgewick Hotel
Location: During your exploration of the flooded corridors get to the elevators. The fountain can be found in the corner to your right.
4) Times Square
Location: This fourth fountain is located to the right of the exit from the laundromat (beginning of the mission).
5) Times Square
Location: Explore one of the hallways of the skyscraper. You'll find the fountain just as you're about to enter a larger room with one of the artifacts.
6) Public Library
Location: The sixth fountain is in the hallway leading to children's study. It's very easy to find.
7) Museum of History
Location: You can find this device in a long hallway and you can get there not long after using the Slime Gun to uncover a secret door.
8) Return to Sedgewick Hotel
Location: The last eighth artifact is located near the generator room. You'll find it as soon as you've left the kitchen.
Comments: Completing this assignment will require you to drink water from eight different fountains. These objects are hidden in the first five levels of the singleplayer campaign (including the tutorial mission). Use the description and pictures seen above to find them which shouldn't be a problem. If you decide to use the Replay Mission feature to get to the missing fountains make sure to reach a new checkpoint after drinking water, because otherwise your progress won't be saved and you'll have to try again.
Heat 'Em Up
Requirements: Purchase all upgrades for the Proton Gun.
Comments: Proton Gun is by far the most useful weapon in the game, so I would recommend purchasing at least some of the upgrades as soon as possible.
Requirements: Burn down the labyrinth during your stay in the castle.
Comments: This challenge is tied directly to the sixth mission of the game (lost island). Start off by getting to the castle and finding the labyrinth. You must now burn ALL the hedges using your Proton Gun. You can't miss any of these objects. Thankfully the labyrinth itself is rather small, so it won't take too long. You'll be given your reward after you set fire to the last hedge.
I Ain't Afraid of No Ghost
Requirements: Trap your first ghost.
Comments: You can complete this objective during the tutorial segment.
I Don't Want My Face Burned Off
Requirements: Purchase all upgrades for the Meson Collider.
Comments: This is the last weapon you'll get your hands on and it's not that useful. As a result you should focus on upgrading other guns first and leave this one for later.
I Feel So Funky
Requirements: Allow Slimer to knock you down.
Comments: There shouldn't be any problems completing this assignment, because sooner or later you'll be slimed by the ghost. This will probably occur during the tutorial mission or during your first stay in the hotel.
I Looked at the Trap, Ray!
Requirements: Trap 20 ghosts.
Comments: Don't forget to set up your own traps, because only those will count. If you're lucky you'll end this challenge long before the end of the game.