Completed the first stage

Completed the second stage

Completed the third stage

Completed the seventh stage.

Completed the eleventh stage.

Completed the first stage on the hardest difficulty

Completed the second stage on the hardest difficulty

Completed the third stage on the hardest difficulty

Completed the first stage without crashing.

Completed the second stage without crashing.

Completed the third stage without crashing.

Completed the first three three stages without crashing.

Earn an extra life

Earn a second extra life

Earn a third extra life

Earn a fourth extra life

Hit 100 targets

Achieve a maximum points bonus from a runway.

Earn the bridge bonus

Shoot down an enemy plane without being shot down in return.

Shoot down five enemy planes without crashing or being shot down in return.

Shoot down ten enemy planes without crashing or being shot down in return.