Update: I was unfortunately not aware of Shamus Young's severe criticism of Fallout 3 available here to link in the original piece and I regret that. It dovetails rather nicely with what I've written and it's much better executed than my piece. I strongly recommend anyone...
Go to options on your main menu and turn on tutorial mode. Next start your tutorial on the turning tutorial, when you are turning slide your finger the correct way 3 times realy fast so can can run forever.
At the Title Screen enter the code for a effect: samhines86 - Unlimited Invincibility rxh7nigh - Unlockable Characters
In order to do it, turn on the Tutorial Mode, and start the game. At the very first turn, swipe to the right twice. By doing so, the runner will turn around, and you'll be able to keep running without moving a finger, since there aren't any obstacles either.
Fulfill the required task to unlock each achievement. There are 22 in total.
1/2 Million Club - Score 500,000 points
1/4 Million Club - Scored 250,000 points
10K Runner - Run 10,000 meters
5K Runner - Run 5,000 meters
Adventurer - Scored 25,000 points
Allergic to Gold - Run 1,000m without collecting any coins
Athlete - Ran 2,500 meters
Double Resurrection - Resurrect twice in one run
Head Start - Use a Head Start
High Roller - Scored 100,000 points
Lump Sum - Collected 500 coins
Mega Bonus - Filled the bonus meter 4x
Million Club - Score 1,000,000 points
Miser Run - Run 500m without collecting any coins
Money Bags - Collected 1,000 coins
Novice Runner - Ran 500 meters
Payday - Collected 750 coins
Piggy Bank - Collected 250 coins
Pocket Change - Collected 100 coins
Resurrection - Resurrect after dying
Sprinter - Ran 1,000 meters
Treasure Hunter - Scored 50,000 points