I never thought I would ever attempt to be a completionist in this game, until I realized that it actually may be a feasible feat for me to do. I was one of those people that played New Horizons to the ground in its early months, and then got completely burnt out as a result. I remember Christmas 2020 was the last season I really decorated for & played on New Horizons until the 2.0 update in Nov 2021! In my hiatus from ACNH, I obsessively played Pocket Camp & New Leaf, until the huge 2.0 update drew me back in.
At that point, I had played over 1,000 hours of game play, and had over 6,000 Nook Miles saved up. Now that I play ACNH daily again, I've actually been playing while keeping the goals of completing things in mind. I recently tackled the very tedious feat of obtaining a complete clothing catalog! I thought I had a lot of clothes pre-2.0, but I still needed over 1,700 clothes to complete my clothing catalog! With trading galore, and a few good souls I have encountered along the way to help me in this completion journey (shout out to BrokenSanity here in the forums), I am down to just 3 more clothing items left to complete my clothing catalog!
They're all summer items, so instead of desperately seeking them, I'm just gonna enjoy when those items come naturally to me during game play one day. It would feel more like a victory then!
My next completionist goal is to complete all of the Nook Miles achievements. Even as an in game time traveler, this will take a long time to do! But being aware of the things in game that I have to do to make progress on certain Nook Miles achievements, help me to play my game more efficiently. Things that I have totally skipped out on before, like cooking & planting crops, I try to do on a daily basis so I can hopefully some day finish those Nook Miles achievements. I have just recently been gifted the Brewstoid from my dear friend Brewster, and am 20 fossils left to finishing the fossil assessment section.
I'm also changing my island section by section, and want to really "finish" my entire island to maybe one day commemorate in a dream address. I have never done that before! I also still have HHP to "complete" and roll credits in. I'm desperately anticipating being able to change my villagers' homes to reflect their personalities more. (And to also get rid of sea basses in my villagers' homes from trades & gifts in the past
) I have yet to complete my museum, with only 1 sea creature left to catch for my Critterpedia. I am in Mush Season currently just so I can try to catch the elusive umbrella octopus.
But in all this, I try not to stress myself out. If I find myself doing that, I just stop playing the game for a few days until I feel motivated to play again. I'm carefully trying to avoid burnout, and also to enjoy the slow nature of the game as it's intended to be. Like I feel like I'm the only one who hasn't finished HHP, but it's really OK. Along with all of my other ACNH goals, I'll get there eventually...