Kill 5000 enemies.
Kill 4750 enemies.
Kill 4500 enemies.
Kill 4250 enemies.
Kill 4000 enemies.
Kill 3750 enemies.
Kill 3500 enemies.
Kill 3250 enemies.
Beat stage 5.
Kill 3000 enemies.
Beat stage 4.
Kill 2750 enemies.
Kill 2500 enemies.
Beat stage 3.
Collect 125 upgrades.
Score more than 50,000 points in a single run.
Kill 1000 enemies.
Collect 50 upgrades.
Beat stage 2.
Beat stage 1.
Collect 5 upgrades.
Kill 100 enemies.