OMG this game is so frustrating in the "normal" single player mode.
I've completed the first 3 chapters including the single player only side missions, and it looks like I'm only missing 3 guns(if all the spaces get filled), but I looked in the archives and it looks like I've done absolutely nothing so far. There are so many empty spaces!! Am I really expected to find all that stuff!!?
And one question, can you blast doors open with the shotgun? I've only found one so far(wasn't really looking) and I used a grenade to open it.