In the first level, leave the TV turn on, do not listen and keep roaming around, will earn an Achievement.

Find many Duck as you can.

Hint 1: Go back to elevator to continue
Hint 2: get the codes on the eyesight board
Hint 3: Code is 629

Hint: Access to the vehicle light control

Hint: Random press it will still work!
Answer: 1, 2, 4

Hint: Look for the item in the last room

Hint: Translate the morse codes into number
Answer: 327