Here is the full list of all 25 Shoppy Mart: Steam Edition achievements.
Scan 500 Items
Unlocked Crazy Hobo
Completed 10 Orders Successfully
Scan 100 Items
Unlocked Stoner
Scan 10 Items
Scan 1000 Items
Completed 100 Orders Successfully
Completed 500 Orders Successfully
Reached Hell
Unlocked Albert
Unlocked Buttface
Unlocked Rapper
Unlocked EDM Producer
Unlocked Larry
Unlocked Writer
Unlocked Jimmy
Completed Shoppy Mart: Steam Edition
Unlocked Rosanne
RIP Headphone users
Unlocked Veteran
Unlocked I'm With Stupid
Unlocked Nova
Unlocked ???
You've reached level 10 and unlocked the new register!