Kill an alien boss creature. (Juggernaut, Rumbler, Turtle, or Crasher)

Build 20 towers of any type in one mission.

Win any mission without selling any towers.

Earn a silver (or better) medal.

Earn a Bronze (or better) medal in a Single Player Mission.

Use the Reload Checkpoint option.

Kill an alien carrying a power core.

Kill 1 alien.

Use the speed up control for a total of 60 seconds in any mission.

You have entered into your first trade agreement.

Successfully complete a Driver/Team Negotiation during a season in Driver Career or My Team

Achieve "Killstreak" bonus 30 times.