Promote any unit to sergeant.

Finish all 60 missions at least once.

Kill a behemoth tank with a grunt unit.

Kill 100 enemy units.

Kill 200 enemy units using the Sniper.

Kill 1000 enemy units.

Get one million from the oil derricks over time.

Kill two enemy units with one shot.

Kill five enemy units with one shot.

Kill three enemy units with one shot.

You purchased the game. Thank you. :)