Here is the full list of all 47 Temtem achievements.
Complete the main questline.
Obtain 20 different clothing items.
Capture one of the two available Temtem species at Saipark.
Capture, evolve, or hatch a Luma Temtem.
Complete the classificatory rounds by playing 10 ranked competitive matches.
Teach a Technique Course to a Temtem.
Ring the bell on any elevator.
Equip a gear item to a Temtem.
Defeat Sophia in a Dojo Leader rematch.
Defeat Rawiri in a Dojo Leader rematch.
Defeat Tihani in a Dojo Leader rematch.
Defeat Yareni in a Dojo Leader rematch.
Defeat Musa in a Dojo Leader rematch.
Defeat Dr. Sasaya in a Dojo Leader rematch.
Defeat Murdag in a Dojo Leader rematch.
Defeat Percival in a Dojo Leader rematch.
Defeat all Dojo Leaders in rematches.
Successfully interact with the altar at Dabmis' Rest.
Successfully interact with the altar at Inner Flame.
Successfully interact with the altar at Sons of Crystal.
Successfully interact with the altar at Aisha's Hearth.
Successfully interact with the altar at Kami Shrine.
Successfully interact with the altar at Chieftain's Barrow.
Explore and complete a Lair.
Explore and complete a Lair with a 3-player party.
Capture or hatch each starter Temtem.
Decorate your house with at least 20 different items of furniture.
Wear a fully dyed clothing item in each slot.
Wear a fully dyed clothing item in each slot, without repeating any dye.
Capture, evolve, or hatch 151 different Temtem species.
Capture, evolve, or hatch all the different Temtem species.
Have an item 99 times in your backpack.
Rename a non OT Temtem.
Complete all the FreeTem tiers in one week.
Complete three food parcel deliveries in the same day.
Complete the 400 encounters successfully in a radar.
Show a 5/5 Koish before showing a 4/5.
Drop a WishYouWell Coin in each well.
Capture or hatch a perfect Temtem.
Perfect a Temtem's TV using fruits.
Perfect a Temtem's SV using telomere hacks.
Set your squad with all of Tuwai's evolutions.
Breed a Temtem with an egg technique.
Get a level 100 Temtem with all perfected stats, fully TV trained, and including all egg techniques in its learnset.
Instantly hatch a Temtem using an Incubator Ticket.
Participate in a Temtem tournament.
Win a ranked battle.