Very similar to the achievement Breaking and Entering, you must enter into a mini-game in order to bypass electronic devices. The electronic devices that can be bypassed are either alarms, or keypads. There are also well more than twenty electronic devices, so this should not be a problem at all.
For this mini-game, there are a few circuits, some containing a number. These lines are winding, and are meant to confuse you if you're not paying attention. You must go through each individual circuit, and cut them in the correct numerical order by pressing to complete the mini-game. Finish the mini-game twenty times for the achievement. If you're about to fail, you can usually abort the mini-game and try again without raising an alarm. It doesn't always work, but more often than not, it will.