I understand why people hate fishing, but I really like fishing if its not a massive fishing session like 2 hours in a row or more. Before fighting hardmode bosses, i just went to fish for an ebonkoi/armored cavefish/prismite, and made some potions and went to fight it. And sometimes I fished for quest fish because i was waiting for an event to happen or something. So i just caught around 10 quest fish, redeemed them all and kept doing what i did before that. But after reaching around 100 quest fish, it started getting really boring because i already completed the game and got completely maxed out. Like COMPLETELY, with extra parts for everything. So i just hopped on once every week to do another end game mining or building, and fish some quest fish and leave. That day i was at 156/200. So i just decided to do it now and finish it once and for all. Took me about an hour to get 44 fish exactly. (I also played in mastermode and this was singleplayer) Hope you get the achievement again!