Full list of all 37 Save Room - The Merchant achievements. It takes around 3-4 hours to unlock all of the achievements in the base game on Windows.
The base game contains 21 achievements, and there is 1 DLC pack containing 16 achievements.
Examine 25 items
Mark and buy multiple items at once
Mark and sell multiple items at once
Upgrade a weapon to the max specs at once
In level 39, acquire access to the shop in less than 90 seconds
Beat level 40 in less than 4 minutes
Sell a treasure of every type
Perform 250 item combinations
Bought 100 itens from the merchant
Sell a total of 1,000,000 ptas worth in items
Craft 1000 ammunition pieces of any kind
Buy a total of 1,000,000 ptas worth in items
Spend a total of 1,000,000 ptas worth in weapon upgrades