Here is the full list of all 12 Marvel Puzzle Quest: Dark Reign achievements worth 1,000 gamerscore.
Beat the tutorial.
Beat the prologue.
Beat chapter 1.
Beat chapter 2.
Beat chapter 3.
Beat chapter 4.
Beat chapter 5.
Max out a character.
Collect 15 covers for any character.
Match an eight of a kind.
Get a 9 chain combo.
I love it when a plan comes together.