I am submitting a proposal which would ensure a constant game for the character, it does not make it into a result, "the killing machine".The essence of such murder in 1000 (for example) units of each monster or creature, the player receives a certain (logical) reward.
Sample list:
FAUNA
Brahmins   +1% damage resist,+5% outdoorsman
Dogs        +1% damage resist,+5% outdoorsman
Geckos     +1% damage resist,+5% outdoorsman
Rats         +1% damage resist,+5% outdoorsman
Mantis      +1% damage resist,+5% outdoorsman
Plants       +1% damage resist,+5% outdoorsman
Scorpions  +5% poison resist,+5% outdoorsman
"...your life you annoying little creature, you do not stay in debt..."
MEGAFAUNA
Aliens         +5% poison resist,+5% radiation resist,+3AC
Centaurs     +5% poison resist,+5% radiation resist,+3AC
Floaters       +5% poison resist,+5% radiation resist,+3AC
Deathclaws  +5% damage resist,+5% radiation resist,+3AC
"...horrible monsters have left the living space on your body..."
HUMANOIDS
Ghouls         +5% radiation resist,+5% FA,+5% Doctor
Mutants       +5% radiation resist,+5% FA,+5% Doctor
Men            +10% science,+5% FA,+5% Doctor
Women       +10% science,+5% FA,+5% Doctor
"...dead humanoids much more interesting to live..."
ANDROIDS
Robots         +20% repair,+20% science
"...entertaining robotologiya..."
           
                    As a result, if the player will have come full circle killing monsters (16 000 dead creatures!!!), the total bonus amount to:
            
damage resist ------->+11%
poison resist   -------->+20%
radiation resist-------->+25%
outdoorsman  -------->+40%
FA------------------------->+20%
Doctor------------------->+20%
Science------------------>+40%
Repair-------------------->+20%
AC------------------------>+12
Thanks