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