Beated the first boss
Completed five levels
Beated the second boss
Completed ten levels
Completed twelve levels
Beated the final boss
Purchased a THUNDER
Purchased a HELL BUSTER
Purchased a RED SHADOW
Purchased your first upgrade
Purchased all upgrades for one tank
Killed 72 monsters
Used boost 60 times
Collected 50 photons
Collected 100 photons
Collected 150 photons
Yeah! Rock!