Shoot one Invader
Destroy 100 Invaders
Destroy 1000 Invaders
Destroy 5000 Invaders
Destroy 10 000 Invaders
Destroy 50 000 Invaders
Destroy 100 000 Invaders
Obtain a chain of 5
Obtain a chain of 10
Obtain a chain of 15
Obtain a chain of 20
Obtain a chain of 25
Obtain a chain of 30
Obtain a chain of 35
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