The Office Quest

Here is my 100% Achievement Guide!

This is the room directly after the pinata at the beginning of the game. When you break the pinata using the broom (Found in the same room as the maintenance guy) pick up the novelty hammer. Go into the next room and you see a maintenance guy working on something, so wait for him to put his hammer down, then click on it to swap them around.

To the left of him is an alarm bell, so hit that twice, once to smash the glass and the other to activate it.
Once activated, immediately click on the thing that the guy is working on to hide in there.
As soon as the boss comes out of his room, all wet from the sprinklers, click the right hand side of the screen, to get up and move on unlocking this achievement.

Go to 3:00 in the video to see how it is done

Hope this helps!