Challenges (Aliens: Colonial Marines)

Like you for the initiative, sorry I only have AvP 2010 in my Steam (

Well, I need to put the whole clip in without a miss and without letting go of the bear to kill, and how to do it?

at what kind of boss you need to find a thread ..................))
... ..... ((

Hi all. please tell me how to pass the test in the alien colonial marines (this is not the end) it is very necessary. waiting for an answer )