Here is the full list of all 27 Ooblets achievements.
Travel to Tippy Top
Sell 100 crafted items
Win 3 dance barn tournaments
Scan 25 ooblets at the Lernery
Travel to Pantsabear Hill
Sell 50 crafted items
Fulfill 15 Plenny's orders
Scan 10 ooblets at the Lernery
Complete 20 Tinstle Tasks
Collect forageables from 4 different regions
Travel to Port Forward
Craft 20 items
Win 15 dance battles
Travel to Nullwhere
Get 10 friendship stickers
Complete 10 Tinstle Tasks
Harvest 50 crops
Get 3 friendship stickers
Travel to Mamoonia
Collect 40 things from the sea dangler
Win 5 dance battles
Get 150 friendship points
Complete 5 Tinstle Tasks
Plant 15 seeds
Scan 3 ooblets at the Lernery
Look at 10 thingiedoodles
Collect 60 forageables