Crackdown achievements?

[Big Bro04]

Is it possible to get all of the achievements with only one boss left? (I also have the expansion.)

[gebbie]

one of the acheivments is to kill everyone(the bosses/their crews).. so i doubt it.

[Big Bro04]

Well no, obviously not that one. There were some I was questioning, but no I believe I've found my own answers. =]

[lemurslits30]

You should be able to get them all except for three:
Shai-Gen Cleanser and The Trifecta are obvious ones and you'll get them after killing Wang. By killing Wang, you'll unlock him for time trials, allowing you to get the Psych Out achievement.