Not sure if this has been posted, but looks like the achievements are stored on the FM server instead of your local device.  

For example:  

You can get use GC and adjust the ride height of your cars.  Get all the acheivements but don't collect your gold just yet.  Then use the cloud save to restore your GC you spend on adjusting the ride heights.

You'll notice all the ride heights are gone, but you can still collect the GC in the achievement area and will say you've completed the achievement.

Quite a few clicks for a some GCs, but it's still free gold!