Saved the world numerous times.

Completed basic pilot training.

Cleared bridge area of an alien nest.

Cleared fuel depot area of all alien nests.

Cleared compound area of all alien nests.

Cleared nuclear area of all alien nests.

Executed 50 aliens.

Executed 100 aliens.

Executed 250 aliens.

Executed 500 aliens.

Executed 1000 aliens.

Executed 2000 aliens.

Destroyed 3 alien nests.

Destroyed 5 alien nests.

Destroyed 10 alien nests.

Destroyed 25 alien nests.

Destroyed 50 alien nests.

Destroyed 100 alien nests.