Here is the full list of all 36 UPPERS achievements.
Activate Panty Slots.
Get 1 Love Letter.
Defeat 1 grunt.
Defeat a boss with an Upper Rush.
Successfully perform an Upper Rush.
Perform a Rise Up.
Change clothes in the ONEPOINT shop for the first time.
Lift Shopping District's Queen skirt.
Get 30 Love Letters.
Defeat Chapter 1 boss with a finisher.
Clear Act 1.
Clear Act 2.
Clear Act 3.
Clear Act 3 Side Story.
Clear Act 4.
Clear Act 5.
Clear Act 6.
Clear End Chapter.
Reach maximum (LV5) Voltage.
Perform a Friendship Upper Rush.
Get a match in Panty Slots.
Watch every reward cutscene for 1 Queen.
Get 50 Love Letters.
Unlock all playable characters.
Defeat all bosses on the streets.
Use all map gimmicks.
Defeat a boss with a Friendship Upper Rush.
Watch every reward cutscene for 4 Queens.
Get "Ino-Shika-Cho" in Panty Slots.
Get "World Expo" in Panty Slots.
Watch every reward cutscene for all Queens.
Get 100 Love Letters.
Clear all Panty Slot combinations.
Clear the last Chapter without taking any damage.
Activate map gimmicks/special actions 100 times.
Obtain all available trophies.