Here is the full list of all 29 Scarlet Maiden achievements.
Earned after 10th run
Gain 100000 sin total
Level Bruce to level 5
Level Roman to level 5
Level Faelina to level 5
Defeat the Earth Mother
Defeat the Grand Archivist
Defeat Queen Lily
Complete the quest ‘Steamy Contraptions’
Complete the quest ‘Masquerade’
Complete the quest ‘Magic Flute’
Complete the quest ‘Green Delight’
Completer the quest ‘It’s a Strap’
Level up to level 10
Level up to level 50
Slay 100 enemies in one run
Find 20 items in one run
Find 50 items in one run
Gain 15000 sin in one run
Slay 200 enemies in one run