Kill at least one enemy with each weapon available in the game

Wipe your Gas Mask 20 times.

Make 30 deals in weapon shops.

Complete the level BLACK STATION without killing or knocking out any enemies.

On the level OUTPOST reach the radio tower and broadcast the commander's message.

On the level DEPOT silently kill the first guard and break into the Fascist station unnoticed.

Complete FRONTLINE level without killing anyone.

Kill 30 enemies with flame grenades.

Explode 30 enemies.

Kill 15 human enemies with Headshots from at least 30 meters' distance.

Use a Medkit 75 times.

Kill 100 enemies with shotguns.

Kill 30 human enemies with headshots.