Achieve an S rank.
Unlock all extras.
Collect every entry in Target Library.
Complete Survival mode.
Complete Boss Rush mode.
Complete the main game in Hardcore mode.
Leave Earth behind.
Stay behind.
Destroy the intruders.
Install every system from the shop.
Achieve a combo of 40.
Hear Miller's last words.
Shoot your shot with the alien interrogator.
Type 100 total bonus words.