There is a somewhat easy way thanks to the
new Title Update to get this achievement but it requires a few preconditions:
1. You should have finished the game at least on "Easy" - that way you would get a better feeling for the game's location layout.
2. You need to unlock the "
Heartblood" factor. It makes your character invulnerable to any damage when you press down (
) on the gamepad. You can follow
MMMDI's guide to finish the new Title update DLC and once you beat the boss of the title update you unlock the "Heartblood" factor.
3. Select the "Hearblood" factor on the main menu and start the game again on the "Easy" difficulty.
4. Once you are able to jump, press down (
) on the gamepad (you have a movement-tutorial at the beginning where movement is limited and you cannot activate the invulnerability).
5. You need to
be careful with the invulnerability: you need to deactivate it whenever you want to use the shotgun. It also automatically deactivates when you use a grenade. Also avoid endless pits.
6. Play the game again from chapter 1 through to 4. In chapter 2 you will find the boots and the antenna cable, in chapter 3 the shotgun, in chapter 4 the grenades.
7. Since you should have the 5 journal pages if you previously finished the game, you can skip all bosses and head from chapter 4's grenade location right back to the hidden area in chapter 1 where you can enter chapter 6. The path is described here :
8. Run through chapter 6 (I used
the lower-path shortcut) and defeat the last boss without taking any damage. Once you defeat the boss you will unlock the achievement after the short cut scene.
You can get through the game without fearing any damage. The modifier also makes sure that you don't pick up any healing items. If you already finished the game on "Easy" then you should be familiar with the layout. Like
Anubseth mentioned in his guide, keep an eye on the smiley face in the lower left corner of the screen indicating that the achievement is still valid. It took me around 20-30 minutes to get through this playthrough.