Following a Hundred Years of Cultivation, I'm dying Before I Got Cheats

Jiang Chengxuan accidentally transmigrated to the immortal cultivation world and accidentally obtained the immortal cultivation heritage.
However, his qualifications were really low, and after a hundred years of hard work, he was still unable to advance to the Foundation Establishment Realm.
Just when he was discouraged, he came to a mortal city in silence, ready to end his life. That was when he got the long-awaited cheats.
Detected that the host has achieved 100 years of immortal cultivation, hereby granting a life extension fruit, which can increase the life expectancy by one year.
The next achievement task was now issued.
Please complete the quest a hundred times. Complete it to achieve the honor of completing the quest a hundred times and you can get a chance to complete the quest smoothly.
Ding!
Please complete 100 times of technique practice, and achieve it to obtain a sense of perfection in technique inheritance jade talisman.
Please complete 100 times of energy training to enhance the foundation bone.
Please complete 100 times of talisman-making achievements...
Please complete 100 times of enlightenment achievement...
Please complete 100 times of alchemy achievement...
Please complete 100 times of poisoning achievement...
Please...
Unknowingly, when Jiang Chengxuan heard the system's prompt again, he was told that there were no more achievements worthy of him to complete, because his existence itself was already an achievement that could never be surpassed.