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