DETECTIVE - The Motel

This achievement is tied to being able to get into the room with the locked keypad.

The keypad (for room #5 I think) is tied to the drawing above the keypad. You need to look through the window to find items that are located where the drawing shows.
First item is a red playing card #7
2nd item is a picture of birds #2
Third item is a blinking light on the back wall. It blinks three times so #3
Last item is the picture on the right of the room with the #5

So it's 7, 2, 3, 5 to open the keypad and get the achievement.

Once you're in the room you need to pick up keys and unlock the green truck right outside of the room. There are supposed to be keys on the desk when you walk into the room by the model ship but they were not there for me. I had to restart the game, as first time I unlocked this room last, and then I went straight to the room and the keys were there. Unlocked the car and achievement popped.

Hope this helps you guys out!