In Endless "Builder" Mode -
When You Start Construction On A Part Of The Generator, Someone Tells You About The Ability To "Rush" Construction.
Clicking This Button Will Pretty Much Instantly Finish The Current Build, But Give The Generator A "Fault".
This Fault Is A Debuff To The Generator You Are Building And Can Range From More Coal Consumption To Less Heat Zones Or Locked Power Levels, Etc, Etc.
Click The Rush Button On Every Stage Of The Generator To Gain This Achievement.
Combine This WIth The "Winter Ready" Achievement.
Good Luck!