You will need to create a Blueprint at the Workbench. While crafting/upgrading a gun, you have the option of pressing to create a Blueprint. This will automatically put them in the Blueprints section of the menu within the Workbench. This may actually go along with the "Full House" achievement if you were heavy on your upgrades. This can be more trial and error since you can't actually see how much the Blueprint is worth in total resources until you craft it. Just make as much upgrades as possible and create the Blueprint. Go to see how many resources it took, then reload the game and either try again, or wait until you can create more expensive parts.
Note: If you have the limited edition or obtained certain pre-order bonuses, the weapons given as a bonus may be worth well over 2000 and you can easily make a blueprint out of it to gain the achievement very early on in the game.