I just finished my normal+ playthrough and a few of my weapons are not fully upgraded. Do I have to start another playthrough to upgrade them all or is it possible to get them through chapter select?
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You are going to have to do a New Game + playthrough to bring all your upgrades over to that playthrough and then be able to fully upgrade your weapons and Joel if you want to get that trophy as well. There are not enough tools and supplements in one playthrough to fully upgrade everything. If you do chapter select, you will have the amount of supplies, upgrades, etc that you had during that time/chapter.