The quickest way to do get this is done is to replay the first mission a bunch of times, and get an A rank by arresting the first few suspects before you get to the dining room with the hostage. This gets you the same four upgrade points you’d get for completing any other level on any difficulty.
Once you’ve put some levels into speed and damage, you won’t have any difficulty just rushing those first few suspects to put the bracelets on them, and you’ll one-shot the last three bad guys.
And afterward, having a supercop on the team helps a lot with the later levels.