Arms Addict Achievement
Collect 100% of all weapon data.There are 147 total weapons to learn about in the game. Most will be given by acquiring weapons (purchasing, finding or creating them), but some can only be learned about by inspecting "prop" weapons, speaking with NPC characters or fighting an enemy who has that weapon. A detailed list and how to obtain each one can be found here. Whenever you come to a new town, buy any weapon in its shop, even if you're not going to equip it.