The first year, 4th of July falls in the weekend so this day will be skipped!
You will have to play through the whole year and then play another year.
These years are from March to September (not a full 12-month year)
Skipping jobs is the fastest way to get on this date (best ones are cleanup because you don't need to start a lawn mower)
When the 4th of July has arrived in year 2:
- Use a SCAG or Toro lawn mower (I used SCAG Turf Tiger II)
- Complete the cleanup phase (not sure if this is needed or not, I did this just in case)
- Fully complete your task (best to take a 99.5% needed to be faster)
I have tried skipping the task but the achievement will NOT unlock!
These are the things that I did so 100% that you would unlock this achievement
On PC if you want to be sure, make a copy of the savefile folder
AppData\LocalLow\Curve Digital
This can be deleted and copied back just in case you made a mistake