Nintendo Switch Sports Resort has no external trophies - no Xbox achievements, no Steam achievements, no platform tracker. Everything lives inside the game, which makes completion tracking a matter of knowing the three counters to watch.
There are 60 Achievements in total: five for each of the twelve sports. They are the renamed "Stamps" from Wii Sports Resort - and in this game, "Stamps" now means the in-match emoji reactions instead. Each Achievement awards a sport-specific cosmetic. Two verified examples: bowling a strike or a spare in every frame of a game, and winning a tennis match with at least three smashes. Nintendo has not published the full list of names or conditions, so treat any complete list you find online with suspicion.
The island's photography challenge is split across three vehicles: 105 photos from the Prop Plane, 80 from the Skateboard and 60 from the Power Cruising boat. Photos trigger during the Sightseeing Tour - free play and timed modes may not unlock them at all, so use the tour deliberately.
The second collectible track consists of 128 missions built around three types of target: balloons, hibiscus flowers and dolphins. These are also a Sightseeing Tour activity, and they are the reason to keep exploring after the photo set is done.
Do the achievements and photos while the game is fresh, because the ladder is the long grind and the collectibles are the ones you can genuinely miss. Then push the ladder. Do the weekly Item Center sets on a schedule - they rotate every week, and the rebuy unlock only works if the prior week's set was completed on time.