Go so/as far as to…
Definition 1 of 2
Pro Tip 1/3Extreme Measures
Used when someone does something unexpected or unusual to achieve a goal. 
He went so far as to learn her native language just to impress her.
Pro Tip 2/3Surprising Effort
Shows that an action taken is beyond what is typical or normal. 
To ensure success, she went as far as hiring a personal coach.
Pro Tip 3/3Not Literal
The phrase often exaggerates the action for emphasis, not always a literal extreme. 
He went so far as to camp outside the store for a week to get the new phone.