Mega Man X Legacy Collection

Beat Mega Man X3 on normal. You cannot lower the difficulty and earn the trophy. Make sure to collect all the armor parts, heart tanks and sub tanks. However, to limit playthroughs, get the Z-Saber. You can either collect the Hyper Chip or skip it.

This trophy will pop after the credits. But the important thing is to not forget that after defeating Kaiser Sigma, you have to escape. You can still die and have to redo the entire last boss battle all over again just to get to the credits.

Tips and Tricks

I’d recommend starting things off with Blizzard Buffalo. He’s easy to avoid.
If you’re having trouble, get the Hyper Chip for dealing with Sigma.
Also, go for the Z-Saber upgrade, since it’s an equivalent to Hadoken or Shoryuken.

Bosses

Opening Stage
Maoh the Giant(Weakness: Buster)

8 Boss
Blizzard Buffalo (Weakness: Parasitic Bomb)
Toxic Seahorse (Weakness: Frost Shield)
Tunnel Rhino (Weakness: Acid Burst)
Volt Catfish (Weakness: Tornado Fang)
Crush Crawfish (Weakness: Triad Thunder)
Neon Tiger (Weakness: Spinning Blade)
Gravity Beetle (Weakness: Ray Splasher)
Blast Hornet (Weakness: Gravity Well)

Note that depending how you progressed through the game, the bosses of the first two stages will change.

Final Stages
Godkarmachine 0 Inary (Weakness: Ray Splasher) or Press Disposer (Weakness: Tornado Fang)
Vile Mk-II & Brown Bear (Weakness: Parasitic Bomb/Tornado Fang) or Volt Kurageil (Weakness: Frost Shield/Triad Thunder)
Dr. Doppler (Weakness: Acid Burst)
Sigma (Weakness: Spinning Blade)
Kaiser Sigma (Weakness: X-Buster)