I Have Hundreds of Millions of Skills

This is a story about the protagonist going from invincible to invincible. The introduction is short and weak, as follows: "Kill the alien beast for the first time to complete the first blood achievement and obtain a skill" "Kill the Zerg for the first time to complete the first blood achievement of the Zerg and obtain a skill" "Kill the demon for the first time, complete the achievement of the demon's first blood, and obtain a skill" "Kill the orcs for the first time to complete the first blood achievement of the orcs and obtain a skill" ... Tang An: "So many skills! I don't have enough skill points." System: "Don't be afraid, the first drop of blood will give you 50 skill points." Tang An: "Only 200 skill points. I have more than 300 skills and they are still at level one." Zerg, Demon, and Orc: "Come and accept your fate!" Tang An: "The long-range skills are activated at the same time! Go away and play, don't bother me to add more points."