Is not possible since the charms points given by the creatures, even if you managed to kill them all enough its unlikely that you get 500 to buy the cheapest charm, the creatures that gives the most are rotworm and minotaur and only give 15 points
https://tibia.fandom.com/wiki/Rotworm
To give more prove, lets do the math just to be sure
Chicken 5
Rabbit 5
Cat 1
Sheep 5
Pig 5
Deer 5
Rat 5
Snake 5
Cave Rat 5
Spider 5
Young Troll 0
Wolf 5
Bug 5
Troll 5
Poison spider 5
Bear 15
Wasp 5
Goblin 5
Troll guard 30
Orc 15
Skeleton 15
Orc spearman 15
Rotworm 15
Minotaur 15
TOTAL = 196 Points