Here is the full list of all 12 At Your Feet achievements.
Unlock both Natalie's endings with a score of 100
Unlock Natalie's Pianist Ending
Unlock Natalie's Revenge Piano CG
Unlock both Lucy's endings with a score of 100
Unlock Lucy's Conformist Ending
Unlock both Victoria's endings with a score of 100
Unlock Victoria's College Ending
Unlock Natalie's Teacher Ending
Unlock Lucy's Maverick Ending
Unlock Lucy's Truth Or Dare CG
Unlock Victoria's Athletic Ending
Unlock Melanie's CG