To get this achievement you must Save partner 10 times when HELP is displayed. If you are playing like normall you should get this around chapter 2 to chapter 3. This achievement will come at the pace of your partners skill if there bad you will get it sooner. The HELP command is displayed when your team is under a special kind of attack that they cannont escape from and most of the time will kill them. All you have to do is run over to them and hit the "B" button on your controller to help them out of the situation. Now all you have to do is do this another 9 times.