Mega Man X Legacy Collection

To beat the final boss use the catapillars to refill on health, Sub-Tank energy, energy for weapon power, and lives. I'll have assumed you have all the upgrades at this point including the Hadoken but if you don't just comment or message me and I'll tell you how to get what you are looking for.

The Hadoken works as a 1-hit kill on any enemy in the game (except Sigma's final form) as long as you have full health and haven't been damaged yet this life. You can perform it easiest by using the control stick. Do a
when on the left side of the screen followed with a fire button (just like in Street Fighter II).

#1 Sigma's Dog: Hadoken him right off the bat, sometimes he jumps first but not always. The important thing to remember is not to have a charge up shot ready as that will give him invincibility frames when it hits him thus not connecting with your Hadoken afterwards.

#2 Sigma (with Sword): easy Hadoken here and he's out fast, he just runs into it.

#3 Sigma's Wolf Face: Forget the Hadoken here it's too tough to be effective. Only thing that hurts him is the Fully Charged up Spiral Shot (your Enhanced X-Buster) and if you are super close the Armadillo Shot works too. But first, use the fully charged up Chameleon Shot power to become invincible and then easily climb to a platform pad and stand on the edge of it with your one foot hanging in the air. The only way he can hurt you now is when his other platform crashes into you. Keep charging your Spiral Shot and fire when you are high enough. When he gets super close, pause the game, and select Armadillo Shot and get a free hit in.

After he's dead the achievement will pop. Comment with anything that can make this guide better and wow I'm so happy to have this game on Xbox One Finally!!