Here is my save file that I have been working on for a few days. It is saved in the lobby right before you go up and use the Hotel Stairway Key to get up to the 3rd floor. I have attached a document on how to acquire each ending from where the game save starts. Also, you should be able to acquire the following achievements from this game as well:
Free to Go - "Leave" ending
Second Best - "Maria" ending
Goodbye - "In Water" ending
Say Your Prayers - "Rebirth" ending
It All Makes Sense Now - "Dog" ending
Never to be Heard from Again - "UFO" ending
Warp Speed - Complete in 3 hours or less
Playing on the Edge - Complete in 2 saves or less
Hard to Hit - Receive less than 500 points of damage
I.Q. Test - Complete Extra Riddle difficulty
You should be able to get some of the other achievements (Special Items, Boat Level, Specific kills). If not, just finish the game and start a new one. You should get the 10 Gold Star Rating allowing you to get the Green Hyper Spray Achievements.
Hope you guys enjoy this. This is my first file upload so feel free to send me any feedback!!