Purchased level 4 of the Shield, Gun, and Engine upgrades
Received a score high enough to make the Leaderboard
Completed the Megalopolis level on Hard difficulty
Completed Alien Base level on Fury difficulty
Received a score high enough to make the top of the Leaderboard
Received a score of 2 million points or more
Received a score of 1.5 million points or more
Your Ranking was changed to "Warlord"
Your Ranking was changed to "God"
Completed any level with a 65% accuracy rating or higher
Completed any level with a 75% accuracy rating or higher
Completed the Frozenland level on Hard difficulty
Completed any level with a 85% accuracy rating or higher
Completed Canyon level on Hard difficulty
Completed Volcano level on Hard difficulty
Completed Alien Base level on Hard difficulty
Completed the Megalopolis level on Fury difficulty
Completed the Frozenland level on Fury difficulty
Completed Canyon level on Fury difficulty
Completed Volcano level on Fury difficulty
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