on gamefaqs.com,i found bonus mission codes i can enter. i am not sure if these codes will disable achievements or not. firefox won't let me copy and paste the link to gamefaqs or copy and paste the codes on here for some reason. here are a couple of the codes i am talking about:
unlock 4 extra missions 6aPHuswe
unlock 6 bonus missions Cr34ufrE
do these codes disable achievements? i would like to know before i use them.