Yakudatazu Skill ni Jinsei o Sosogikomi 25-nen, Imasara Saikyou no Boukentan Midori Kashi no Akira - Vol. 6 Ch. 28.1 - The Secret of the Dark Greens

[MangaDex]

 

[rexmundi]

So, he is jealous with other adventurer achievement.

 

[Kaarme]

Dude should have become a professional assassin. He has the perfect skill for it and also possesses a complete disregard for life.