Lies Of Astaroth

Sunset Tower is map 2 level 7. It comes after 2-6 "Silver Moon Port". All you must do it get every chest and fight every monster in the tower. On the top right of your screen there will be a counter for each monster and chest, the counters are separate for each floor.

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This is in Map 2. All you have to do is make it through the maze and collect the chests for the achievement to unlock. It is in the Sunset tower with the purple chest next to it. There will be a counter on the top of the screen to tell you how many chest are in the rooms you enter. It is best to explore the whole floor you are on and defeat the monsters for cards.