After a Match, you can press
to go to the "Stats" Tab. This will show you your "Damage Done" that round.
You will find that the average player deals 5-6k damage per game. So on average, this Achievement is going to take about 30-40 matches to unlock.
Who does the most Damage?
In my experience, Gizmo led in "damage done" pretty much every game I played. This is mostly because you can lay down Drones with
. These drones help build a TON of Passive Damage. Also the Flamethrower on the Mech does a lot of damage. I averaged 12-14k Damage PER GAME with Gizmo. Highly Recommend!