So I did this one on an Oculus quest and I'd say the hardest part was parry kills.This is basically where you block someones attack and proceed to kill them while still in slow motion. The weapons they give you for this are not very ideal, so you will want to find a mace and an axe. After collecting these, use the mace to block and break armor and the axe to quickly slice of the head before time runs out. I suggest not trying to block the arrows, because if you miss and die, you'll have to restart to get flawless.