If the Naso is the only tang in the tank, and you buy a heathly achilles that is smaller than the Naso, with your size tank I believe you will be fine (assuming the tank is 6ft +). The Naso will probally chase him for a day or so, but I do not think the Naso will feel too threatened.
I have a Naso with a Powder Brown except I added the Naso after the Powder Brown, and the Naso was smaller. But they get along fine.
Over the years hanging out with the Tang Police I've learned the size of the tank is the biggest factor when it comes to tangs aggression. I dont think a much smaller achilles will challenge a bigger Naso, as long as there is space for the both of them.
Chin Lees procedure in adding the tang is excellant
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