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