Have 50 hand grenades
First mission passed
Use hand grenades only in mission
Win mission with only 1 health
Have 10,000 special bullets
Have 50 health packs
Have 100 of all packs
Have all normal guns
Have all pistols
Have all guns
Kill 500 zombies
Kill 500000 zombies
Kill 5000 zombies
Kill 1000000 zombies
Kill 1000 zombies with headshoot
Kill 100000 zombies with headshoot
Kill 5000 zombies with headshoot
Kill 1000000 zombies with headshoot
Kill 1000 zombies with handgun
Kill 500 zombies with grenade
Kill 5000 zombies with handgun
Kill 5000 zombies with grenade
Kill 50000 zombies with grenade
Be unharmed 10 times at end of mission
Kill 100000 zombies with grenade
Be unharmed 1000 times at end of mission
Be unharmed 10000 times at end of mission
Finish part II
Finish part I
Finish part III
Finish part IV
Finish all story missions in hard mode
Finish all story missions in normal mode