Sundy Stairway Achievements Here is the full list of all 53 Sundy Stairway achievements.Filter Achievement View View Image viewList view Sort by TrueSteamAchievement desc TrueSteamAchievement asc Achievement name desc Achievement name asc TSA Ratio desc TSA Ratio asc Gamers desc Gamers asc Steam order Date won desc Date won asc What are achievement flags? Click to find outApply Sundy Premium Welcome Melanie! Under the SeaComplete 1st Boss Battle in Hard Mode of Stairway 1 (without changing difficulty from options menu) Broken PlateComplete 2nd Boss Battle in Hard Mode of Stairway 1 (without changing difficulty from options menu) Welcome back mom! Treasure Hunter Expert 1Find all mystery boxes on Stairway 1 Welcome Winter! Welcome Anghela! Sweet PrincessComplete 1st Boss Battle in Hard Mode of Stairway 2 (without changing difficulty from options menu) Surpassing My FearsComplete 2nd Boss Battle in Hard Mode of Stairway 2 (without changing difficulty from options menu) Anghela and Abril Treasure Hunter Expert 2Find all mystery boxes on Stairway 2 Sunday LV10 Sunday LV20 Sunday LV30 Calm ExpertReach 100 CALM points with any character Welcome Sasha! Young LoversComplete Boss Battle in Hard Mode of Stairway 3 (without changing difficulty from options menu) Bye Bye Sannie...Complete Stairway 3 Treasure Hunter Expert 3Find all mystery boxes on Stairway 3 Sunday LV40 Sunday LV50 Welcome my dear Jazmine! Farewell to my First LoveComplete Boss Battle in Hard Mode of Stairway 4 (without changing difficulty from options menu) Broken Heart Treasure Hunter Expert 4Find all mystery boxes on Stairway 4 Sunday LV60 Unbreakable BondsComplete Boss Battle in Hard Mode of Stairway 5 (without changing difficulty from options menu) Friends Forever Treasure Hunter Expert 5Find all mystery boxes on Stairway 5 Sunday LV70 Nightmare Slayer - BronzeDefeat 10 enemies Nightmare Slayer - SilverDefeat 100 enemies Nightmare Slayer - GoldDefeat 1000 enemies Compulsive Buyer - BronzeSpend $1000 at vending machines Compulsive Buyer - SilverSpend $10000 at vending machines Compulsive Buyer - GoldSpend $50000 at vending machines Sunday LV80 Sunday LV90 Sunday LV99 Do Not Deserve to be ForgivenComplete First Boss Battle in Hard Mode of Stairway 6 (without changing difficulty from options menu) Broken PromiseComplete Boss Battle of Route A in Hard Mode of Stairway 6 (without changing difficulty from options menu) The Rebirth of the StarComplete Boss Battle of Route B in Hard Mode of Stairway 6 (without changing difficulty from options menu) The End of The Liminal World Treasure Hunter Expert 6Find all mystery boxes on Stairway 6 Perfect Party!Level up all characters to LV99 Complete Item CollectionGet all Items Complete Accesorie CollectionGet all Accesories Complete Enemy CollectionDefeat all kind of enemies Complete Mystery Box CollectionFind all Mystery Boxes of all Stairways Complete Outfit CollectionGet all Outfits Complete Weapon CollectionGet all Weapons Thanks for Playing!