First open your control panel


Then click on "Clock, Language, and Region"


Then click on "Set time and date"


Click on "Change date and time" and set it to halloween (originally i though you had to set it to halloween 2016 but apparently any date between Oct 24th and Nov 11th of any year will work)


Now open SUPERHOT into the challanges folder


Then click on the challange known as "Pumpkin"


And load up a level, once you do you should get the achievement




Thank you for reading my guide! let me know if this worked for you in the comments below!