Here is the full list of all 49 BLUE REFLECTION: Second Light achievements.
Obtain all Achievements.
Explore all locations.
Raise Kirara's Talent level to maximum.
Raise Yuki's Talent level to maximum.
Raise Uta's Talent level to maximum.
Raise Mio's Talent level to maximum.
Raise Hiori's Talent level to maximum.
Raise Hinako's Talent level to maximum.
Raise Ao's Talent level to maximum.
Raise Shiho's Talent level to maximum.
Raise Rena's Talent level to maximum.
Raise Kokoro's Talent level to maximum.
Collect all memory shards.
Defeat "The World."
Create Origin Gate.
Get all characters to level 50.
Activate Ether Tide with all characters.
Get Ao to level 50.
Recover Uta's memories.
Activate Ether Tide for the first time.
Recover Yuzu and Lime's memories.
Go on 100 dates.
Fulfill 50 requests.
Develop 30 facilities.
Craft 50 different items.
Recover Yuki's memories.
Defeat "The One Who Came from Nothing."
Recover the Hirahara Sisters' memories.
Go on 50 dates.
Develop the bath.
Recover Kirara's memories.
Fulfill 25 requests.
Go on 25 dates.
Access 10 different school facilities.
Develop 15 facilities.
Recover Rena's memories.
Craft 25 different items.
Defeat "The One Who Fell from the Sky."
Recover Hinako's memories.
Cut grass 50 times.
Use an item to remove an obstacle from a path for the first time.
Recover Shiho's memories.
Activate a One-on-One Finisher for the first time.
Develop a facility for the first time.
Go on a date for the first time.
Recover Kokoro's memories.
Repair the leak at the school.
Fulfill a request for the first time.
Craft an item for the first time.