Slay The Spire

For this achievement you need to complete the 3 acts in the Daily Climb, this is not tied to the leaderboard or anything.

To get to the daily climb select play in the main menu and choose the second option.

From here you can see what modifiers will be on the run.
Look for modifiers that make it very easy. (The run I won made it so normal enemies drop relics)

If the current daily climb is too hard it will reset the next day to something else. Check the top left corner for a timer for when this will happen.