Here is the full list of all 37 Winged Sakura: Mindy's Arc 2 achievements.
Unlocked all other Achievements
Defeated Every Boss on Hard Mode
Reached Level 99
Completed Every Free Stage on Hard Mode
Upgraded an Equipment to +20
Unlocked All Units
Completed Wave 200 on Survival Mode
Acquired All Powers
Completed Every Free Stage
Defeated Every Boss
Completed Wave 100 on Survival Mode
Completed All Side Stories
Completed Chapter 6.5
Completed the Epilogue
Maxed All Character's Affection Level
Completed Chapter 15
Upgraded an Equipment to +15
Uncapped an Equipment to 5 Stars
Completed Chapter 14
Completed Chapter 13
Completed Chapter 12
Completed Chapter 11
Completed Chapter 10
Completed Chapter 9
Completed Chapter 8
Completed Chapter 7
Completed Chapter 6
Completed Chapter 5
Completed Chapter 4
Completed Chapter 3
Completed Chapter 2
Uncapped Your First Item
Crafted Your First Item
Completed Chapter 1
Acquired a New Power from Cindy
Upgraded Your First Item
Completed the Prologue