Mega Man X Legacy Collection

You need to beat the final form of the final boss, with either X or Zero. It doesn’t matter if you use the Ultimate armor or the Black Zero armor. It doesn’t matter if you beat it on Rookie Hunter mode either (but remember, there is a trophy for beating X4 without using Rookie Hunter mode).

This is an in depth battle against Sigma. The first form of Sigma is cloaked and is easy to defeat with fire. Hit him with fire 2 times, then get on a wall and air dash over him, repeat. The second form is his reaper form and is a bit trickier. It is weak to Lightning Web, which seems easier if you charge it for a larger range.

After beating those forms, his 3rd and final form will appear. This form has two bodies, one a giant gunner (Gunner Sigma) in the upper right corner and the other a huge head (Earth Sigma) in the lower left. Only one will appear at a time, and in between them you have to face the three floating elemental heads. Each boss body has a separate life bar as well.

Gunner Sigma's attacks are easy to predict and avoid completely. Just don't stand in line with his gun.

Earth Sigma will either blow tornadoes at you to a wall of spikes, in which you should rapid dash toward him and blast away (this is the prime time to attack), or he will suck in a bunch of earth with the elemental heads creating little spike walls. In either attack, you want to be standing in between where the elemental heads appear in his earth attack. That gives you protection from the earth attack as well as plenty of room to dash from a spike wall if he uses wind. In either form, you can blast away.

The elemental heads are just typical attacks. The red shoots fire from the left, the blue freezes the middle and floor from the right, while the yellow shoots sparks at you from the upper center. Their attacks aren't too bad and can be avoided though you still want that sub tank.

Once you beat both of them, Gunner Sigma will reappear, there will be dialogue and he explodes. Beat him and the trophy will pop after he explodes.