You unlocked all Stages
You completed the tutorial
1000 enemy units destroyed
5000 enemy units destroyed
1000 miles flewn
10000 enemy units destroyed
Buy all spaceships from the store
5000 coins collected
Spend 10 hrs playing the game
Die 100 times
Score 1 million points
Destroy the train
Use boost 10 times
Escort the brain without damage
Use revive 10 times
Finish a level without dying
Use the speed boost for the first time
Die 2 times in the same game
Finish all stages