Mega Man X3 (Mega Man X Legacy Collection)- X-Treme Danger achievement guide

So although the game only lets you get one armor enhancement capsule, it is possible to get 3 of the 4 via a Pass Word which is almost as good as having the Hyper Chip. The only armor enhancement the following code does not have is the arm upgrade as I felt the helmet, armor, and leg upgrades are more useful. Additionally, this code also has the Z-Saber.
5114
6685
6872
3115

I recommend entering the Sigma fight with the Z-Saber ready to go. Dodge his first attack of fireballs, then when he jumps up to the center of the room and fires down, hit him with the saber. Then charge up to green and get rid of the first 2 shots and hit him again just like the first time to finish him off.

The second form is a bit tougher because his head is so small and elevated and the mines he fires do a ton of damage. It is possible to hit him from either side but it’s easier from the left side so his back isn’t protecting his head. At the start of the fight, charge up to green and ditch the first 2 shots again as he moves to the left side. Dodge his mines and missiles and once he moves back to the right, jump over from the top left wall and saber him in the face. Do that twice to finish him off for the achievement. Of course, since this is the last battle, use any sub tanks as needed.