Full list of all 50 Holy Potatoes! A Weapon Shop?! achievements. It takes around 20-25 hours to unlock all of the achievements in the base game on Windows.
The base game contains 45 achievements, and there is 1 DLC pack containing 5 achievements.
Complete Wolverinnie's Request
Complete Kamen Tater's Request
Forge 50 Katanas
Forge 50 Cannons
Forge 50 Rifles
Forge 50 Throwing Weapons
Forge 50 Staffs
Forge 50 Spears
Forge 50 Pistols
Forge 50 Swords
Forge 25 Katanas
Forge 25 Rifles
Forge 25 Cannons
Forge 25 Staffs
Forge 25 Spears
Forge 25 Throwing Weapons
Forge 25 Pistols
Forge 50 Daggers
Complete Spudttousai's Request
Forge 50 Wands
Complete Hairy Pota(to)'s Request
Complete The Locksmith's Request
Hire Nikola Taterla in your shop
Hire Haepharion in your shop
Complete David's Request
Complete Blue Boy's Request
Forge 25 Swords
Complete Gordon TrappedMan's Request
Complete Luke Spudwalker's Request
Hire Heisenberger in your shop
Hire Tony Starch in your shop
Forge 50 Axes
Complete Johnny Sparrow's Request
Complete Hero's Request
Get 2,500 items from explorations
Forge 50 Bows
Complete Nyandalf the Grey's Request
Hire Okazaki Masamune in your shop
Complete Kratatoes' Request
Complete POTaDOS' Request
Forge 25 Wands
Forge 25 Axes
Forge 25 Daggers
Forge 25 Bows
Complete Claude Strife's Request
Complete Herclueless's Request
Complete Julios's Request
Meet Hermes
Collect 5 Molted Plumes for Athena
Complete Poseidadoes's Request