| 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.
One tip to get this achievement is to find the shortest possible gaps to jump through. However, there are some large gaps in the level. Additionally, there are some parts where you have to go side to side, which is hard for the Skater.
Alternatively, you can beat Level G-9 as the Skater and then choose another side to use. This makes the achievement easier, but requires you to make a long jump near the end to finish the level as all but one of the sides (the one you normally spawn on) disappear. Sometimes when doing this jump, you will get the achievement, but you won't finish the level, strangely.
Yet another way to make this achievement easier is to fail the level a few times at the start. This will cause the Skater to start trying harder, letting you clear the long jumps more easily.