Cause the Alien to retreat by using the flamethrower

Use the revolver

Knock down a human or stun an android with a non-lethal attack

Detect 30 targets with the motion tracker

Finish the Game on Hard Mode

Perform 10 successful hacks

Complete the fifth mission without being killed by the Alien

Collect 50,000 Red Orbs

Use the vent system 20 times

Escape from android combat without taking damage

Kill an Android

Encounter the Alien in Sevastopol for the first time

Collect an ID tag