Here is the full list of all 8 Mahjong Strip Solitaire: Harem Guild achievements. It takes around 3-4 hours to unlock all of the achievements.
Play the game.
Clear all of Tina's stages.
Clear all of Sara's stages.
Clear all of Alicia's stages.
Clear all of Sonia's stages.
Clear all of Nell's stages.
Match all the tiles and clear a stage.
Clear all the stages.