|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.
(Note: Since you can only earn this achievement with the Child, he will be the only suggested character.)
In order to complete this achievement, you will have to take advantage of the small diagonal spaces between the platforms. To do the crossings, move right or left to the edge of the platform that you are currently on and wait to fall, but then gain traction on the next platform. This can require accuracy in the transitions. Be prepared for bumpy transitions all the way through.
The strategy to get this achievement is to save your three jumps until the end of the level. Once you begin, move straight to the left to transition to the next platform. Then, move hard at left to reach the next transitioning point. This transition requires the most accuracy as the gap between the two platforms is quite large. After that, move ever so slightly to the right for a very easy diagonal transition. Finally, move to the right once again for the second last non-jump transition. Jump on this next transition and again with the next, but make sure for the second jump that you land on the most right part of the platform. Do one final non-jump transition and use your last jump to clear the last gap.