Red ones are not confirmed or uncertain.
B1: Just feed pets, this does not count for feeding Kogo only the pets that can follow.
B2: You need a Goat, feed pets on your land and then have the goat clean up the mess. You can't pick up the poop yourself. The count is every time you click the cleaning command, not the number of poop cleaned.
B3: Just Scavenge, this is the same as the weekly task but you have 3 months.
B4: Equip worms, fish, eat, repeat. Or let your energy regen the slow way its just slower that way.
B5: Sit in game, do anything or nothing. It seems to be counting even if I'm in a gold chair.
I1: You need the bunny that Kit sells. Feed it and scavenge with it. You MUST have the Radar tamer ability unlocked.
I2: Kale has the Summer Gardening Shirt Recipe.
I3: Find and Pet shark puppys. I don't see one anywhere so you must find people who have them. I've got 2 on my land hopefully others will report theirs too. Only the Grey one counts.
I4: You need a normal cow on a doghouse, feed it and let it produce milk until it gives you 2 of the blue carton milks. This is random but chance is effected by the cows happiness level. CANNOT BE DONE WITH A RED COW
I5: It looks like you just need to change land this many times. You can go up and down from your land to town 200 times or just hit that random land button until it procs.
N1: Fish with a stick, NOT worms. I caught 2 shark puppys in 1 rod so they seem to be easier this year.
N2: Recolor items in your inventory, any recoloring item works.
N3: Catch and sell a lot of this fish. Its pretty easy to do with worm fishing.
N4: 1 Pet Chow = 2 Eggs. I don't remember if this recipe came with the Chef job, if not Trixie should sell it.
N5: Find and do 9 quests. This can be done with Alice + Clay. If you miss Clay or for any reason are missing quests, start a new character and do Adelaide's quests or starting job quests. All your characters count towards the squares they're account based not character unique.
G1: Do any tasks that requires energy, Greenhouse and Fishing are easiest unless you really want to craft a ton.
G2: Kogo jobs seem to give 25 exp per job. You have 2 kogo in a barn, netting 50 exp per send so better get started.
G3: Daily tasks you should probably already do. If you don't sub I think theres 12 per day, if you sub there's 2 extra. There's a weekly tasks for 70 completions so if you grab that gacha ticket every week you'll have this square in 2 weeks. If not then luckily you have all summer.
G4: Craft anything as a builder. Planks and Dowels are fast, cheap, and good for the long run.
G5: You need a normal sheep on a doghouse, feed it and let it produce wool until it gives you 2 of the blue wools. This is random but chance is effected by the sheeps happiness level. CANNOT BE DONE WITH A GOLD SHEEP
O1: Alice has the Luxury Lace Belt Recipe.
O2: Scavenge till you find the required amount of ore.
O3: You need a normal chicken on a doghouse, feed it and let it produce eggs until it gives you 2 of the brown eggs. This is random but chance is effected by the chickens happiness level. CANNOT BE DONE WITH A WHITE CHICKEN
O4: Head north of town and look for Aky, the white dog with a blue mark on its head. They're medium difficulty I'd say, I usually just throw nets, and have a 50/50 chance of a catch with no bait. If you want to ensure the catch feed it first.
O5: Grow potatoes, it will take 3 full harvests (all 16 plots) +2 extra to complete this.