Speed Limit (UP)

As the description suggests, you must complete the entire game on normal difficulty in under 30 minutes. If you already completed the game you probably know if you can attempt this in the first place, some levels that gave me trouble were stage 9 and stage 10, just because I didn't fully understand how to complete them fast, especially the final boss. If you want you can practice the levels you need by selecting them from the main menu and when you want to try for the achievement just start from Stage 1 and complete all the levels in order. You can die plenty of times and still get the achievement, 30 minutes is a lot of time for this game since multiple stages are like 1 or 2 minutes long. The achievement will pop when the credits start rolling.

Video of me getting the achievement in 22 minutes with several errors: