| It's just so frustrating that I have to start over every time I fall.
This achievement is rather difficult and is considered quite hard. Due to its hard difficulty, the number of power cells is higher than most achievements. Infinite Mode level achievements are not affected by this and they still keep their 25-75 power cell rewards.
There is no suggested character, since you just need to complete the whole tunnel, your suggested character will be the ones you mastered. What make this hard is since you need to pass some tough levels like part 17, 18, 19 and 20
In Kongregate, after you earn this achievement, you also get a Medium badge, which awards you for 15 points.