Here is the full list of all 16 Dark Reflection achievements.
You took care of the flowers.
You have found a bonus level in Our World.
You have found a secret character in the Our World.
You have opened a portal to the Dark World.
The game is completed. Classic ending.
The game is completed in a short (non-classical) way.
You finished the game in a magical (non-classical) way.
You killed the Boss in the Dark World.
You killed the Boss in the Dungeon.
You entered the Dungeon.
You found the secret room.
When all Red Jumpers are destroyed.
You have found a bonus level in Dungeon.
You have returned to Our World from the Dark World.
You were seduced to death.
When you returned to the Dark World from the Dungeon.