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