Seriously you've done a fantastic job.
I don't think we have ideas for the other achievements (like we did submission), what you've come up with works really well.
One thing I would like to see redone eventually though is the Executioner icon. Originally executioner was 3 consecutive headshot kills which is why the icon looks like it does. I would like to see it a front view of an infiltrator head in black, with a commissioner to the left, and a bullet exploding out of the right.