Full list of all 12 Monday Night Combat achievements worth 200 gamerscore. It takes around 2-3 hours to unlock all of the achievements on Xbox 360.
Achieved 15 kills in a Crossfire Match
Achieved 10 grapple kills in a Crossfire match
Achieved a kill on an opposing player while they were upgrading skills in a Crossfire match
Achieved a Ring Out during a Crossfire match
Achieved a pancake on an opposing player using the Gunner's Ground Slam ability
Completed "Season" Blitz mode
Achieved a 3 kill streak in a Crossfire match
Achieved Most Valuable Player in a Crossfire Match
Completed "Exhibition" Blitz mode
Complete "Playoff" Blitz mode
Complete "The Scramble" Blitz mode
Achieve a Triple Kill