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Headcrab Frenzy! achievements progress.
Complete "HCF_Killbox" arena.
Complete "HCF_Dungeon" arena.
Complete "HCF_Labmoar" arena.
Complete "HCF_Range" arena.
Complete "HCF_Factory" arena.
Complete "HCF_Temple" arena.
Exterminate 1500 generic headcrabs.
Exterminate 2000 fast headcrabs.
Exterminate 2500 fire headcrabs.
Exterminate 3000 ice headcrabs.
Exterminate 3500 poison headcrabs.
Exterminate 4000 electric headcrabs.
Exterminate 4500 ethereal headcrabs.
Exterminate 5000 hallucinogenic headcrabs.
Shoot 500 headcrabs using firearms.
Perform 250 nice catches.
Cause some disorder in the Museum.
Spend 60 minutes in Frenzy mode.
Regenerate 100,000 health points.
Score 1,000,000 points in a single match.
Survive all 8 "Ladder" waves.
Survive 20 waves in "Ladder" game mode.
Survive 20 waves in "Random" game mode.
Don't be bitten at all during a single wave.
Beat the game on "Easy" skill level.
Beat the game on "Medium" skill level.
Beat the game on "Hard" skill level.
