...c'mon, MC getting this titles is way too much...
I can barely accept the wind one, as MC have a massive mana pool he can spam them with ease, but in the top 10 in the world at not even 10 years old only because he can spam simple magic, the author exagerated.
And the other one is even worse, you telling me that no other adventurer is better at killing goblins? In a world with titles and a clear way to get them is obvious that many adventurers would do their best to get it, and they would have many years of experience and high levels with higher stats.
Is too much, shoudl have been something liek wind wizard that the top 100 mages can have and goblin slayer, for beating the boss almost on his own, and would have been a tier lower.
Even if the title is for the number and not qulaity of monsters of one type killed I storngly doubt MC would be the one to get it.
Is stupid.