I Earn Achievements in Douluo

Good news, time travel! Bad news, it's Douluo! Good news, there is a system! Bad news, you are not the only one who has traveled through time! One day when Tang San came to the Eye of Ice and Fire, he found that the fairy grass had already been looted! The four single-attribute sects were also conquered, and even Xiao Wu was hunted! By the time he arrived at Poseidon Island, the Poseidon throne had already belonged to someone else! Tang San: "..." Luo Chuan: "If it wasn't me, who would steal your opportunity if there is a system?" "Ding, trigger the achievement mission!" [Persistence] Swing the sword 10,000 times a day, persist for thirty days, and you will be rewarded with sword-drawing skills! [Long Distance Running Champion] Run ten kilometers every day for thirty days, and you will be rewarded with the Dragon Step! [Mosquito Killer Expert] Kill one hundred mosquitoes every day for three days, and you will be rewarded with soul-increasing incense. [Iron Will] Sleep with a member of the opposite sex without distracting thoughts, and you will be rewarded with double cultivation skills! [Sage of Love] Having three beauties will reward you with beauty pills! Wait, why is this mission getting so outrageous? … As long as you complete achievements, you can get various rewards. Years later, Luochuan looked back and realized that he was already invincible in the mainland! (Original plot in the early stage, returning to the main line in the middle and later stages) (Tang San will be robbed of his opportunity, but he is not the protagonist)