Smash 15 vending machines
Find all the parts of Demikhovsky's diary
Complete the Arena Challenge
Complete the Axe-man Challenge
Kill the centipede
Ride the train
Kill Demikhovsky
Kill Dreadnought
Kill your first cadaver
Beat the game
Open the shelf in the desk
Complete the Labyrinth Challenge
Pick up soap in the shower room
Dispose of the old boss
Take "heavenly" pills
Unlock a combination lock
Find a condom
Find a secret passage
Complete the Skirmish Challenge
Score a goal with your head
Watch a TV show