This is a level that consists mainly of just 3D platforming, and quite a lengthy one at that. Though not that difficult of an achievement this can be quite annoying as trial and error is required on some of the jumps. If you fall off into a void, hit the Back button and go to the Main Menu and just load up from your last auto-save. There are a handful of auto-saves in this level and they are never incredibly far apart.
Toward the end of the level you will start to fight a few more enemies, including a boss. It is highly unlikely that any enemies will kill you, but if the boss takes away all of your armor you CAN recover and continue fighting without having to reload a save since it isn't technically considered a death.