Just completed story mode on Normal, overall I have done 65% complete.
I bought all skills, but haven't bought all weapon upgrades (I still need most of the weapon parts you find through out the world)
Although at least I have fully upgraded the shotty (imo the best weapon) so you can now blow enemies away with ease. ;)
All the other collectibles like relics and stuff I haven't found much of as I just focused on finishing the story.
Download here: http://www.mediafire.com/download.php?zyd899sa3rs8btr