Way of the Samurai 3

To get these achievements you need to find every weapon and unlock every skill on all them. Please follow the link under Weapons Arsenal to find a list off all weapon locations.

To unlock the skills you have two choices: Either keep using every single weapon to unlock them naturally - only do this if you have a few months to spare to just play this game - or the infinitely faster method of buying skill scrolls. From Day 5 onwards, you can buy the Basic, Advances and Special scrolls from the weapons merchant in the Posting station. The most efficient method for doing this is to first earn yourself around 70,000 Yen from doing jobs or buying and selling high value items then killing the merchants and getting all your money back.

Once you have the 70,000 or so, load up a game on instant difficulty, and rest until Day 5. On Day 5, go to the posting station with three weapons you need skills for and buy ten of each scroll type. Proceed to use the scrolls to unlock all the skills. Once done, use the rest of your money to buy as many of each scroll you can - you can carry ten of each at most at any one time - then kill the merchant, his guard, and anyone around him who has a weapon. On instant kill you will have plenty of time to do this before they attack.

Pick up your money and go back to your house in Takatane. Once there, put your three weapons in the safe, take out three more and use the scrolls you just bought to unlock as many skills as possible. And extra remaining scrolls can be stored in the items box accessed via the cupboard in your house. Just rinse and repeat this method for all weapons. It should take you no more than five or six minutes a time.

Doing this will also unlock the Weapon Master, Weapon Specialist, First Time, Skill Collector, and Master of Skills achievements.