Fire 8 shots within 1 second.

Maintain a critical hit rate above 25% for the whole game.

Land critical hits with every bullet in 2 consecutive magazines.

Complete the entire game using only a pistol.

Let one enemy stay alive for more than 2 minutes.

Finish the game with only one credit.

Kill an enemy during slow-motion mode.

Kill 4 enemies at once with an explosive.

Shoot down a platform support and skewer 4 spear-wielding aliens.

Spare one unarmed alien civilian.

Kill one unarmed alien civilian.

Kill 2 sword-wielding aliens while airborne.

Break a regular object and discover hidden supplies.

Spare two unarmed alien civilians.

Kill two unarmed alien civilians.

Final choice: Kill the heroine and get promoted by the FBA.

Final choice: Kill your superior and trigger the twist ending.