| 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 power cell reward for this achievement is higher than most achievements. Infinite Mode level achievements are usually not affected by this and they still keep their 25-75 power cell rewards if not affected.
There is no suggested character. You just try your best and use the characters you fully-mastered. Good luck!
This achievement doesn't allow you to buy a respawn, but using a free respawn is fine. What you need is survival, so don't go and chase after Power cells when you are determined to get this. One slip, and you need to start this all over again.