the easiest way to find where you got your achievement is to check all of the levels mentioned in this thread - while there may be a couple of solutions missing here, i suspect it is nearly complete.

i was confused about this question myself because, as i finally figured out, the game changed the "perfect" score (in parentheses) for the level where i received the "Better than Us" achievement (but not for any other levels). so if your game did the same thing, then watching the chapter replays won't help!

you can check your personal chapter totals against these "perfect" totals i compiled (with "better than perfect" scores in parentheses).

NOTE: totals do not include timekeeper levels.

Prologue: 115
Illumination: 165
A Cold Heart: 164 (162 is possible via stage 3 level 1)
Ray of Light: 157
Positive Energy: 233
Guiding Spirit: 212 (204 is possible via stage 3 level 1)
In Bloom: 273
Resolution: 250
Testament: 334 (332 is possible via levels 2:1 & 4:3)

1am: 14 (13)
7pm: 23 (22)

i have the list of all individual levels as well, which i'll share if anyone wants.