Complete the game.

Unlock the alternative ending.

Complete the game without using a single secondary weapon.

Complete the game without missing a single bullet.

Obtain 5000+ points on Skywards.

Obtain 5000+ points on Dustfall.

Obtain 5000+ points on Ironclad.

Obtain 5000+ points on Adrift.

Defeat the giant Stinger in less than a minute.

Defeat the giant Pulsar in less than a minute.

Defeat the giant Bomber in less than a minute.

Do not get damaged by any of the final boss' attacks.

Kill a Watcher using the falling body of another Watcher.

Kill a total of 50 aliens using the falling body of Watchers.

Kill a Sniper by reflecting its own laser beam.

Get a 15 kills combo.

Kill 10 aliens using your allied Watchers.