Collect all weapons and weapon parts

You will need to collect every weapon and weapon part to get this trophy/achievement, which includes all primary, secondary and special weapons. Some will be found in enemy supply crates . The rest have to be purchased. Attachments that you need to get for this trophy are suppressors, metal plates, stocks, barrels and cartridges. You do NOT need to purchase styles or camouflages for this trophy/achievement. The amount of money you need altogether to purchase everything will come close to around $1.8 million, so be prepared to replay levels a lot. I suggest choosing levels with the most hostages as each time you save a hostage you obtain roughly $15000-20000