Mortal Kombat vs. DC Universe

I recommend working on this trophy while working on The Competitor trophy. This will greatly simplify and speed up the process. To get this trophy you need to do all Fatalities and Heroically Brutalities. Each character has two finishing moves. If you have problems performing combinations, try doing them on the d-pad or vice versa on the analogue, especially if there is an “Up” movement.
The easiest way to do this is to start the game with two joysticks. Set the round time to 30 seconds, and the number of rounds to 1. After that, either wait until the end of time, or beat the enemy half to death. Then perform the desired method of execution. Do all "Fatalities" with the first joystick.

Mortal Kombat:

Scorpion
Toasty!: Down, Down, Down, (average).
Lava Pool: Forward, Forward, Back, Down, (average).

Sub Zero
Freeze Kick: Back, Back, Down, Back, (close).
Freeze Slam: Back, Forward, Down, Forward, (close).

Sonya
Kiss of Death: Down, Down, Back, Forward, (average).
Neck Breaker: Down, Back, Forward, Forward, (average).

Shang Tsung
Back Breaker: Back, Down, Forward, (close).
Morph: Down, Down, Forward, Forward, (close).

Kitana
Fan Throw: Back, Back, Forward, (average).
Kiss of Death: Forward, Down, Down, Back, (close).

Jax
Head Smash: Back, Forward, Forward, Back, (close).
Air Machine Gun: Forward, Forward, Back, Backward, (close).

Liu Kang
MK1 Arcade Drop: Forward, Back, Down, Down, (close).
Head Stomp: Down, Down, Forward, Down, (average).

Raiden
Slam: Down, Forward, Down, Up, (close).
Electrocution: Back, Forward, Forward, Down, (close).

Kano
Knife Throw: Back, Down, Back, Forward, (close).
Flip Stomp: Down, Down, Forward, Back, (close).

Baraka
Stab Slam: Back, Forward, Down, Forward, (close).
Chest Stab: Forward, Forward, Down, Down, (close).

DC Universe:

The Joker
Gunshot: Forward, Backward, Forward, (close).
Playing Cards: Back, Down, Back, Forward, (close).

Catwoman
Neck Breaker: Down, Back, Down, Forward, (far).
Claw Attack: Forward, Backward, Forward, Backward, (average).

The Flash
Flashy Beatdown: Back, Back, Forward, Forward, (average).
Whirlwind Slam: Down, Forward, Down, Back, Down, Forward, (close).

Superman
Ground Pound: Down, Down, Forward, Forward, (close).
Freeze Slam: Forward, Forward, Down, Back, (close).

Batman
Bat Swarm: Down, Back, Forward, Forward, (average).
Grappling Hook: Down, Down, Down, Up, (average).

Wonder Woman
Lasso Slam: Up, Back, Down, Forward, (far).
Lasso Spin: Forward, Backward, Backward, Forward, (far).

Deathstroke
Gunshot: Forward, Forward, Down, Forward, (close).
Neck Breaker: Forward, Down, Back, Forward, (close).

Lex Luthor
Body Twist: Down, Forward, Down, Back, (close).
Missile Attack: Up, Up, Up, (average).

Captain Marvel
Slam & Stomp: Down, Forward, Back, Forward, (close).
Ground Slam: Down, Back, Down, Forward, (close).

Green Lantern
Orb Squeeze: Forward, Back, Down, Back, (far).
Hammer Smash: Back, Forward, Down, Down, (far).