Here is the full list of all 44 RefRain -prism memories- achievements.
Started the game.
Exited the game from the title screen.
Cleared the tutorial.
Played as Tee.
Played as Mews.
Displayed the log archive.
Displayed the music room.
Made the bear dance on Tee's desktop.
Cleared Central 1.
Cleared Central 2.
Cleared Central 3.
Cleared Central 4.
Cleared Central 5.
Cleared Central 4 on the Easy difficulty level.
Cleared Central 5 on the Normal difficulty level.
Cleared Central 5 on the Advanced difficulty level.
Cleared Central 5 on the Extreme difficulty level.
Cleared Central 5 on the Re:Normal difficulty level.
Cleared Central 5 on the Re:Advanced difficulty level.
Cleared Central 5 on the Re:Extreme difficulty level.
Cleared Central 5 with Miria, Tee, and Mews.
Cleared two laps of Central 5 with Miria, Tee, and Mews.
Saw the normal ending.
Saw Miria's good ending.
Saw Tee's good ending.
Saw Mews's good ending.
Acquire 100,000 Prisms in a single game.
Acquire 999,999 Prisms in a single game.
Destroy 10,000 enemies and bullets in a single game.
Convert 1,800 or more bullets with a single Concept Reactor
Reach a score of 50,000,000 or more.
Reach a score of 500,000,000 or more.
Reach a score of 2,500,000,000 or more.
Reach a score of 5,000,000,000 or more.
Defeat a boss while it's knocked back with a 4-stage multiplier M.E.F.A2.
Clear the Advanced difficulty without losing a ship.
Clear the Extreme difficulty without losing a ship.
Clear the Re:Advanced difficulty without losing a ship.
Clear the Re:Extreme difficulty without losing a ship.
Destroy a total of 200,000 or more enemies and bullets.
Acquire a total of 200,000 or more items.
Acquire a total of 6,000,000 or more Prisms.
Convert a total of 300,000 or more bullets with a Concept Reactor
Exceed ten hours (36,000 seconds) of Dive Time.