try to destroy all cars on level1, the first 1 has a rocket launcher in,and the last one has a pump action shotgun inside.
to kill everyone on level 2 on normal mode,put your back to some one and press:triangle x3, then circle x3.on the second to last punch,hawk will stun him and on the last punch hawk will smack the poor sodd into a wall or something.its better do do this one with hawk.
here all of hawks grab moves:press t riangle before doing these! o will punch ,x will knee em` in the groin, square will toss em` over hawks shoulder and triangle will head butt them.
the easiest way to kill every boss except the naval base boss is to be hawk and grab them, then keep pressing o,remember to pause in between each punch,otherwise hawk will do three punches and then a head butt.or to kill certain bosses, run jump kick and when you've knocked him/her down,just keep on kicking them till they die.