Here is the full list of all 33 Gundemonium Recollection achievements.
Finish the game on Novice difficulty.
Finish the game on Revised difficulty.
Finish the game on Unlimited difficulty.
Finish the game on Demonic difficulty.
Unlock Mission Mode.
Complete Demonic Challenge Mode.
Complete Matrix Orders Mode.
Reach Zone X in Ain Soph Aur Mode.
Clear the game as Eryth.
Clear the game as all 64 Earl types.
Defeat Endymion while Demonic Shift is active.
Destroy 7 cross pieces of Aenea.
Destroy all parts of Volcannon.
Defeat 16 Cyclones in one game.
Defeat 64 Leaf People in one game.
Defeat Slayer while only destroying the main body.
Allow Lumiere to destroy 6 of your bombs.
Defeat Phaser after letting it kill you twice.
Obtain 4 life items.
Defeat Ereshkigal and Irkalla without using bombs.
Defeat Elixirel without being hit.
Defeat Elixirel Kaether through Time Up.
Defeat Elixirel Daath. Matrix Orders mode does not count.
Obtain 1,000 gems in one Area.
Perform a 1,000-Hit Combo in one Area.
Obtain 15,000,000 Points in one game.
Perform 100 Onslaughts in one game.
Perform 4 Friction Breaks in one game.
Perform 10 Counter Bombs in one game. Auto-Counters do not count.
Perform 10 Demonic Shifts in one game.
Obtain an extra life at the instant you lose your last life.
Complete all 32 Play Orders.
Keep the holiday spirit alive.