Here is the full list of all 22 Touhou Luna Nights achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Beat the extra stage.
Defeat Reimu.
Uncover 100% of the map.
Collect all of the items.
Destroy all of the gems in the hidden rooms.
Collect all of the weapons.
Beat the game.
Defeat Flan.
Defeat Nitori.
Throw all vending machine cans in the trash.
Defeat Remilia.
Defeat Patchouli.
Defeat Marisa.
Defeat Meiling.
Defeat 100 minor enemies.
Start the game.
Defeat any boss in 10 seconds (not counting when time is stopped).
Beat the game without using any continues.
Earn an S rank in Boss Rush.
Earn an A rank in Boss Rush.
Earn an B rank in Boss Rush.
Unlock all of the achievements.