Here is the full list of all 50 Mortal Kombat vs DC Universe achievements worth 1,000 gamerscore.
Complete Chapter 1 - DC Universe
Complete Chapter 3 - DC Universe
Complete Chapter 5 - DC Universe
Complete Chapter 1 - Mortal Kombat
Complete Chapter 3 - Mortal Kombat
Complete Chapter 5 - Mortal Kombat
Complete Mortal Kombat Story
Complete DC Universe Story
Perform Klose Kombat
Perform a Free-Fall Transition
Perform a 10-hit combo in Arcade Mode
Finish arcade mode with an MK character
Finish arcade mode with a DC character
Complete Both Mortal Kombat and DC Universe Stories
Perform all Fatalities and Heroic Brutalities
Play 200 Versus Matches
Complete Arcade Mode with all Mortal Kombat Characters
Complete Arcade Mode with all DC Universe Characters
Perform a Heroic Brutality!
Play 100 Chat Lobby Matches Online
Get a Flawless Victory Online
Perform a Fatality!
Win a Chat Room Match Online
Play 10 Ranked Matches Online
Complete Baraka's Kombo Challenge
Complete Batman's Kombo Challenge
Complete Catwoman's Kombo Challenge
Complete Deathstroke's Kombo Challenge
Complete the Flash's Kombo Challenge
Complete Green Lantern's Kombo Challenge
Complete Jax's Kombo Challenge
Complete the Joker's Kombo Challenge
Complete Kano's Kombo Challenge
Complete Kitana's Kombo Challenge
Complete Lex Luthor's Kombo Challenge
Complete Liu Kang's Kombo Challenge
Complete Raiden's Kombo Challenge
Complete Scorpion's Kombo Challenge
Complete Shang Tsung's Kombo Challenge
Complete Captain Marvel's Kombo Challenge
Complete Sonya's Kombo Challenge
Complete Sub-Zero's Kombo Challenge
Complete Superman's Kombo Challenge
Complete Wonder Woman's Kombo Challenge
Complete Darkseid's Kombo Challenge
Complete Shao Kahn's Kombo Challenge
Beat Arcade Max without using a continue
Finish Kombo Challenge mode on MK and DC
Do all Super Moves including Promoves
Win 25 Ranked Matches in a row