Here is the full list of all 12 Solar Shifter EX achievements.
Accomplish the last mission without taking damage.
Accomplish the third Astra Corps mission without taking damage.
Upgrade both weapons to level 2 when you're visiting the Shadow Hub for the first time.
Own 700 credits when arriving to a hangar.
Accomplish the second mission without taking damage.
Accomplish the first mission without taking damage.
Finish the game.
Fully upgrade both weapons.
Destroy Cloud City as the Alien Striker.
Destroy the colony as the Alien Ravager.
Defeat the second Ardath Clan Boss.
Meet Allen Volker for the first time.