I kinda just... did.
I've only reached Perfection once, but just through natural gameplay, we (it was in Splitscreen) completed most of the tasks. I'll go through the list:
Produce & Forage Shipped – You've already done this, and TBH nothing is really that difficult. Dinosaur Mayonnaise and Caviar are probably the trickiest, but even those are fairly trivial.
Obelisks on Farm – Perfection takes time, and in the meanwhile, you'll want to be earning cash. I can see this clashing with certain people's gameplay styles, but really all you need is one Greenhouse full of Ancient Fruit and some Kegs. This nets you around 1M/month and it's super low maintenance, so it can just happen in the background. Of course there are plenty of other methods, but this is probably the simplest.
Golden Clock on Farm – Ditto.
Monster Slayer Hero – I didn't find this too challenging because I mine a lot, but I could see this being an obstacle for less Mining-inclined playstyles. My biggest tip would be "don't pass on Prehistoric Floors!". These are fairly uncontrollable, so make the most of them when you get the chance!
Great Friends – This is where I fell short. I'm not that into the NPC side of Stardew, I've seen most of the dialogue before, so this was more of a chore for me. I got most people up to the maximum, but ultimately I had to rely on my Mum (who was playing with me) to complete this one.
Farmer Level – If you're short on any of these... Farming: Grow Ancient Fruit or any of the long-growth-duration crops (e.g. Rhubarb, Starfruit, Pumpkins). Foraging: Frequent the Secret Woods and chop down all the Stumps. Loads of XP to be had there. Mining & Combat: Go Mining, hit the silver rocks and ideally bring a Club. Fishing: fish where ever, the Desert is great (but ends at 8:00pm).
I'm typically at Level 10 in every skill by the end of Year 1, so this was a non-issue for me.
Found All Stardrops – Definitely not the easiest. If you're missing any, then tell us which.
Cooking Recipes Made – Getting the recipes comes pretty naturally. Cooking them takes a bit of time and some commitment, but I just cooked a couple dishes before I went to bed each day and it was slowly complete. You'll need at least a couple of chests to store all the dishes though!
Crafting Recipes Made – Harder than the one before. I'd recommend checking the Wiki for it's list of Craftables and where to get them. Both the Dwarves have recipes; so does the Desert Trader. They're all over the place! Again, it's very similar to the one above, so make a couple chests and do a couple per day!
Fish Caught – I don't really know why this was included in the list, because you get a Stardrop at the end (which is required for Found All Stardrops). Maybe it was to hint that you get a Stardrop this way? But Willy already has dialogue hinting at that, so maybe not... anyone else got any ideas?
Golden Walnuts Found – Do as many as you can, and then double check all the obvious hoe-spots. We were missing one, it was in a spot I thought we did on the first day! Apparently not. If you need help, then don't be afraid to ask here/check the Wiki.
And that's it!
But to start, I'd make sure you've got the infrastructure to earn the money, then mix making friends (for the goal and the recipes) with exploring Ginger Island. Make sure that you catch any fish/grow any crops that you're missing when they're in season.
Whenever you feel like Mining, make sure you go to the area that has the Monster(s) that you're missing, or the geodes that you need to finish the Museum (that means Skull Cavern if you're missing artifacts, because Omni Geodes = Artifact Troves!).
Perfection is a journey, different people find different parts harder, so don't be discouraged!
I hope this helped in some way, have fun!
