You beat a team of 7 tanks in Arenas Mode. Either you fought well or cheated the CPUs. Either way, you used your knowledge of the game to win. Impressive.
You beat or tied all the developer times in Target Practice Mode.
You beat the first 30 levels of the Campaign. That's the same number of levels that are in the demo!
You beat the first 65 levels of the Campaign. You're more than halfway there!
You beat all 100 levels of the Campaign. Good job! Not even the Expert CPU can accomplish that.
You hosted an online game for another player. Friends required.
You blew yourself up. It happens to the best of us. Just claim it was "advanced movement tech." That's what the dev does.
You got an upgrade for your tank and are one step closer to becoming unstoppable.