Here is the full list of all 24 Acceleration of SUGURI 2 achievements.
Finish Arcade or Story mode without continues or retry
Complete all achievements
Complete Suguri campaign on Normal or higher
Complete Saki campaign on Normal or higher
Complete Iru campaign on Normal or higher
Complete Nanako campaign on Normal or higher
Complete Kae campaign on Normal or higher
Complete Kyoko campaign on Normal or higher
Complete Hime campaign on Normal or higher
Complete Sora campaign on Normal or higher
Complete Alte campaign on Normal or higher
Complete Tsih campaign on Normal or higher
Complete Mira campaign on Normal or higher
Complete Sham campaign on Normal or higher
Complete Nath campaign on Normal or higher
Complete Star Breaker campaign on Normal or higher
Unlock Sumika
Unlock all BGM & Stages
Win a match against a normal or higher CPU without taking damage
Break an enemy Shield
Perform a combo with at least 4000 damage against a normal or higher CPU or another player
Play 100 games
Win a match against a normal or higher CPU without going over 100% Heat
As Alte, use Accel Hyper to KO Sora against a normal or higher CPU or another player