Blindness and Health Boost are not required for the advancement as they cannot be legitimately obtained in survival or hardcore mode. Nausea is part of the advancement and was shown being obtained in this video by eating a pufferfish.
To Be Honest That Wasnt Really Hidden To Me Cause Ive Been Trying To Get That Advancement For Months Now Figuring It By My Self But Then I Watched Your Video Then I Was Like I Give Up Im Gonna Watch How To Do It After Watching It I Tried It And I Still Cant Do It Its Sooooo Hard
I'd say the second hardest advancement is probably getting a Ghast to the overworld and then killing it. First you have to build a portal large enough, then wait patiently for a ghast to spawn AND fly through the portal.
Blindness, health boost, saturation, bad luck and luck are not counted in this video as they are not required to getting the advancement. This is because it's impossible to obtain them without using commands or creative mode. Imagine doing a hardcore survival mode run of the game trying to get all advancements only to find out that it's impossible to get the last one because it requires creative mode.
And slowfalling is actullay pretty easy you just need the phantom to drop the thing and brew a potion out of it and also so that you wont suffer getting way too much gold , iron and emerald in the snapshot just kill the turtles and brew yourself a potion that has resistance 10 and slowness 10 its way better for that than finding ores and reversing everything
*THINGS MINECRAFT NEEDS*
Volcanoes ( do not not erupts like just a design)
EnderKing ( boss and can be found on or after defeating the ender dragon)
Like if you agree!