The Last Faith

You can find Lucyl in a far right room in the first Mythringal area. She speaks about a love. In the same room is one of the light white doors you need the lens to enter. She asks you to bring her the Water Well Flowers. To find them you need to get to the City of Erlim. In the south east room of the first save altar south of where you hear the cannon shooting you will find a big room with little snakes in it. The item is in this room. Just return them to Lucyl for this achievement.