This achievement can be easily completed on level 1-1. You can select the level from level select once you have completed the campaign or you can go for the achievement on your first playthrough.
Once you start the level you will have cars going in front of you one by one. The third car is the one that has the leaper agent on it. You want to destroy the car before he jumps by using your weapons with either
. You will need to destroy the vehicle before you have to counter leaper agent.
Of course this achievement is easier once you have fully upgraded your character, but since this can be done right at the start of level 1-1 you can restart the level if you mess up. I would suggest getting it out of the way as soon as you can just so you don't have to worry about it later.
I had accomplished this achievement on my second try because I was not conserving my ammo and the cool down was taking too long. You will not have this issue if you have already upgraded everything.
Overall, this achievement is quite simple if you are aware of what you are doing and when the leaper agent will show up.
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