Here is the full list of all 37 High Noon VR achievements.
Finish the wave with using a gatling gun and without overheating it
Kill 1000 enemies
Takeout 100 hats without killing enemies
Destroy 1000 destructibles
Kill 100 enemies with rifle
Spend $10000
Kill doctor boss
Spend $2000
Make gun upgrade
Kill 250 enemies
Destroy 100 destructibles
Kill ratboy boss
Kill 100 enemies with revolver
Kill 50 enemies
Destroy 10 destructibles
Score kill with every bullet in cylinder
Spend $500
Collect all weapons
Collect and upgrade all weapons
Blow 10 destructibles with one dynamite
Kill 10 enemies with less then 1% of HP
Kill fatty boss
Kill 100 enemy high in the air
Kill flying enemy with dynamite
Kill 3 enemies with one shotgun shot
Kill 100 enemies with dynamite
Kill 100 enemies with gatling
Kill 100 enemies with shotgun
Achieve x15 combo
Complete 20 quests
Upgrade weapon to max lvl
Make 5 gun upgrades
Make 10 gun upgrades
Make two headshots with one bullet
Make 10 headshots in a row
Kill bitch boss
Kill all bosses