I actually really like this idea. I could be some achievements where you can get titles after doing continuous and almost unrealistic grinding (such as your example when you catch 10k fish, imagine how long that would take). Some other examples I think off the top of my head are from scrambler wins (like if you have at least 1k wins), and some kind of builder title if you place down a certain amount of blocks. Especially in later in the season when things start slowing down it could be something to keep you busy