Here is the full list of all 25 Shoppy Mart: Steam Edition achievements.
Unlocked EDM Producer
Completed 100 Orders Successfully
Unlocked Buttface
Scan 500 Items
Unlocked Crazy Hobo
Unlocked Albert
Completed 10 Orders Successfully
Scan 100 Items
Scan 10 Items
Scan 1000 Items
Completed 500 Orders Successfully
Reached Hell
Unlocked Rapper
Unlocked Larry
Unlocked Writer
Unlocked Stoner
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!