Here is the full list of all 10 Dark Horizons: Mechanized Corps achievements.
You have been killed 10 times.
Completed your first mission!
Got your first kill!
Killed your tenth enemy!
You scored 10 kill assists!
Captured 10 reinforcement points.
Reached 20 kills!
Maybe you should take a bigger mech?
Completed 20 missions, HOORAYY!!
Destroyed 50 enemy mechs!