Here is the full list of all 20 The Symbiant Re:Union achievements.
Start the Cayama Story
Start the Odaria Story
Finish the Odaria Story
Finish the Cayama Story
Meet Juniper’s Lover
Experience a sudden change of plans
Make a life-changing decision
Get 5 innuendos from Brahve
Ask Brahve all 3 questions in the shower
Juniper announces her new lifestyle
Meet Brahve’s cousin
Play a board game on Odaria
Reveal the secret to Chohra
Take a photo of Brahve
Experience an unexpected hardness
Go on all dates with Brahve
Get a special gift from Brahve
Gets all the CGs
Replay all the scenes once
Get all the achievements in the game