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