Here is the full list of all 21 Umichan Two Scoops achievements.
Watch the animation in the intro scene for 10 seconds or longer
Beat the game without Maiko and Pattie participating in any adult situations
Complete Joey's ice cream.
Complete Leyah's ice cream.
Get more than 24 Money.
Complete Tsugo's ice cream.
Get cherries
Watch any replay.
Turn off the screen lock in the settings.
View the Leo scene.
Complete Savori and Amber's ice cream.
Get strawberries
View Chris scene with Peach and Creamy
View the Joiry scene.
view Percival scene
View Pattie throwing ice cream at David
Have a wardrobe malfunction
View the David scene
Make first ice cream successfully.
View Maiko and Pattie's selfie images.
View the in game comic.