My System Really Is a Piece of Junk

[Death-Seeking] + [Anime] + [Anime Crossover] + [System] He transmigrates into the world of Overlord and becomes a mine slave from the start. The world is dangerous, with Bone Daddy as humanity’s greatest enemy. Bone Daddy has his built-in max level, while he has his own bizarre cheat. Get beaten to a pulp, and once you unlock an “achievement,” you can claim a reward. Beat an enemy to a pulp, and if you’re lucky, unlocking an “achievement” can earn you a reward too. But most of the time, I’m the one getting beaten up. Still, even when I lie flat, strange “achievements” keep appearing. I’m no good at writing blurbs. Please move on to the story... (T▽T)