City defeated Paris Saint-Germain 2-0 on the night in Manchester and 4-1 on aggregate to progress to the showpiece event in Istanbul later this month.
Guardiola told the club website post-game: "Absolutely [it's a historic evening].
"Big memories for all the players and all the people who have mad this club big - Colin Bell, Mike Summerbee - many, many of them.
"Congratulations to the owners who took over the club and tried to invest and support.
"People believe it is just about money. If they want to believe that, okay, but it is not just that, it is all departments and the facilities we have.
"I am so proud of the guys. We have done an amazing Champions League and we are there."