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