Commit suicide.
Kill the 1st boss on max difficulty.
Kill the 2nd boss on max difficulty.
Kill the 3rd boss on max difficulty.
Survive 10 waves of enemies in survival mode.
Survive 20 waves of enemies in survival mode.
Survive 30 waves of enemies in survival mode.
Multifire buff maxed out.
Autofire buff maxed out.
Kill the boss while being under 10% health on max difficulty.
Shoot down 10 rockets in one game.
Shoot down 50 rockets in one game.
Destroy 100 drones on max difficulty.
Destroy 500 drones on max difficulty.
Destroy 2500 drones on max difficulty.
Complete the game without losing a single life on max difficulty.
Complete the game without losing any health points on max difficulty.
Complete the game without overheating your weapons.
Earn more than 9000 points.
Kill the 1st boss on easy difficulty.
Kill the 1st boss on medium difficulty.
Kill the 1st boss on hard difficulty.
Kill the 2nd boss on easy difficulty.
Kill the 2nd boss on medium difficulty.
Kill the 2nd boss on hard difficulty.
Kill the 3rd boss on easy difficulty.
Kill the 3rd boss on medium difficulty.
Kill the 3rd boss on hard difficulty.
Kill the boss while being under 10% health on easy difficulty.
Kill the boss while being under 10% health on medium difficulty.
Kill the boss while being under 10% health on hard difficulty.
Complete the game without losing a single life on easy difficulty.
Complete the game without losing a single life on medium difficulty.
Complete the game without losing a single life on hard difficulty.
Complete the game without losing any health points on easy difficulty.
Complete the game without losing any health points on medium difficulty.
Complete the game without losing any health points on hard difficulty.
Destroy 100 drones on easy difficulty.
Destroy 100 drones on medium difficulty.
Destroy 100 drones on hard difficulty.
Destroy 500 drones on easy difficulty.
Destroy 500 drones on medium difficulty.
Destroy 500 drones on hard difficulty.
Destroy 2500 drones on easy difficulty.
Destroy 2500 drones on medium difficulty.
Destroy 2500 drones on hard difficulty.