Here is the full list of all 17 Champion of Venus achievements.
Lose.
Lose to Lamashtu.
Become corrupted by ambrosic slime.
Lose harder.
Become the handmaiden of Lady Inari
Enter [???]'s menagerie.
Become [???]'s snack.
Become Goro's girlfriend...maybe?
Unlock RAT ENDING.
You didn't tear it up, boss.
Spend some quality time with Connie.
End a press conference abruptly.
Become Nenet's girlfriend.
Abuse your position of power.
He preys at night, he stalks at night.
Fall hook, line, and sinker for Goro's manipulations.
Identify a plainclothes FUB.