There Are 16 Total Blueprints You Must Find To Get This Achievement To Pop.
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I Used The Map Below To Find All 16:
https://mapgenie.io/sons-of-the-forest/guides/blueprints(Credit For The Interactive Map Goes To Map Genie, It Was Super Helpful)
However, To Get The Achievement To Pop, After You Get The Last Blueprint, You May Need To Do What I Did:
- Save The Game
- Close The Game Completely (Back To Windows)
- Start And Reload Your Game With All 16 Blueprints
- Pick Anything Up (I Picked Up A Stick Off The Ground)
- Achievement Popped
Good Luck!