Devil May Cry 5

This is the FASTEST way to unlock this achievement, thanks to the Bloody Palace title update.

To play the Bloody Palace, you must at least clear the game once.

Load up Bloody Palace as Nero. There will be 14 Devil Breakers to collect. Run around and collect all 14 (Break them off as you go along.) Then proceed and clear stage one. Once you proceed into Stage 2, head into the pause menu and press give up. You can then load back into the Bloody Palace and do this again. The achievement will unlock once you pick up the last one you need.

In theory, if you completed the game without picking up a single Devil Breaker, you'd need to do this 8 times.

Hope this helps out! It's the fastest known method so far.

Although this should come through natural progression, if you're looking for a quicker method then this is what I suggest.

Load up Mission 15, any difficulty but Human is always good. Not only are there lots of devil breakers to pick up, but there tends to be an abundance of them along the path behind the Divinity Statue, (I think 6-10). So if you want to knock this out just keep reloading that mission.