beat shinobi on ps2 on the hardest difficulty. Final hit the dumbass teleported his back to one of the monsters that spawns during the fight, and you need to chain kill them all to damage him. Sliced the last enemy then it did the animation where it shows them all getting sliced and the boss was dead.
Ninja gaiden black on master ninja difficulty.
Star ocean 2 universe difficulty level 255 beat all optional bosses, and the final boss with his limiter off. All star team of claude, chisator, bowman, and opera.
natural magic playthrough of ff6 so you can only use magic from characters that naturally learn it, so strago, celes, terra. Mimic too if you want. Not that hard since the game is still pretty easy, was definitely interesting in how useful certain characters became and vice versa. Was pretty fun.
Zombie genocide achievement on dead rising 1.
Edit: also beat strider on hard for the genesis.