You completed the tutorial
You unlocked all Stages
1000 enemy units destroyed
10000 enemy units destroyed
5000 enemy units destroyed
1000 miles flewn
Buy all spaceships from the store
Die 100 times
5000 coins collected
Spend 10 hrs playing the game
Score 1 million points
Escort the brain without damage
Destroy the train
Use boost 10 times
Use revive 10 times
Die three times in the same game
Finish a level without dying
Use the speed boost for the first time
Finish all stages