If this option is enabled, all the info buttons are enabled from the beginning. Most info buttons (such as education, crime, land value, etc.) are disabled until you unlock a corresponding milestone. The idea was taken from the Mod Achievement Enabler.
(The game still shows that the achievements are disabled, but actually they are enabled.) If this option is enabled, you would be able to get the steam achievements. Usually you cannot get the steam achievements when you are using mods. This mod is a collection of small features that adds useful functionality to the game. Cities Skyline: Extended Game Options Mod