false modesty
A vain or hypocritical pretense of holding a low or humble opinion of oneself, one's abilities, or one's circumstance so as to encourage others to say the opposite. There's no need for that false modesty here; you are fully aware of your success and achievement, and you don't need me to reaffirm it for you. I find her false modesty quite unbecoming.
in all modesty
Without trying to boast, brag, or seem overly important. You asked me about my career, so I'm trying to speak in all modesty about the successes I've found.