What is the hardest achievement in terraria

[Someone that needs help]

yea i've never done a single fishing quest soooo looks like i gotta lot of work to do

I've done 15

 

[Bambino]

Ain't going to lie. None of them are hard. Could have at least made the achievements not obtainable in Journey Mode and made achievements exclusive to Master Mode/For the Worthy. For example, Mastermode daytime Empress of Light or For the Worthy Moonlord. Reaching 200 fishing quest was mindless. Everything else provided no challenge. Did most of them in Expert mode, and finished them off in Master.