Quod
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Hints without spoiler
By Pino
How you can find the codes and unlock every achievement. Some hints without giving too much away.
   
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Hints
Byron Hadley:
Looks like someone in the cells made a very artistic picture for him.

Paul Edgecomb:
He is stuck in a ventilation shaft, you can even hear him.

Meissner:
Someone with the same name build a communication machine.

Robbie Fisher:
Looks like you have a new lock. Someone left you a note in the security room.

Brutus Howell:
Have you found some fuel for the pump?

Douglas Phillips:
Looks like he is a painter and he smears his colours everywhere.

Laundry access:
Multiple hints. I am sure you will find one :)
Steam Notes
Have you already found Steam Notes? You can find it in the Steam In-game Overlay.
It even saves them in the cloud for every game. Perfect for writing down some Codes :)