You can check out the screenshots and achivements for the DLC here.
[via: Joystiq]
"One and Done"
(30 points): Score the winning point in a game of Keepaway against Legendary A.I.'s
"Pull Hard, Pull Deep"
(20 points): Win and never trail in a Tug of War game
"Freak on a Streak"
(20 points): Gain at least 15 population from a single wave in a Reinforcement game
"Living Loving Bug"
(30 points): Obtain a Scarab during a Reinforcement game
Keepaway, a CTF variant featuring 3 different flags for capture. Next up is Reinforcement, a mode that provides support in waves, disabling your ability to build armies. With Tug of War, the winner is decided based on total volume of assets, including units, buildings, and resources.
Ronnie W
Andreas R 
Derrin K 
Aaron W 