Powder and Primer - Craft ammunition 5 times
To unlock this achievement you will need the Munitions Shop and Library building constructed in at your base. First construct a Regular Workshop. Then upgrade to a Workshop and then finally to a Munitions Shop. After that construct a Library. Once the Munitions Shop is created you will be able to research "Ammo and Manufacture" at the Library. Once all these steps are complete you will then be able to craft various types of ammo from the Workshop. Do this 5 times for the achievement.