The four-time Ballon d'Or victor ended his first European goals since September with the 47th-minute equaliser before putting Madrid in the box seat 13 minutes from time.
Real Madrid chief Zinedine Zidane has verified that Gareth Bale was pulled away in the 2-1 triumph at Bayern Munich due to an injury worry.
Ronaldo said he was happy with how the game had gone, and that he and his teammates had still been confident in the dressing room at half-time even at 1-0 down.
"You'd have to tell me who kept doubting as it never reached me". "To be able to reach this mark is an honour and against a team like Bayern it is better still", he added.
Bayern, who had thrashed Arsenal 10-2 on aggregate to take their place in the last eight, went in front after 26 minutes through a bullet header from Arturo Vidal.
Bayern keeper Manuel Neuer denied Ronaldo and Gareth Bale with fine stops and the tie firmly swung in Real's favor in the 61st minute when Javi Martinez was sent off following two quick-fire yellow cards.
Real's superstar then hit the victor as substitute Marco Asensio, on for Bale, put in a low pass for Ronaldo to tap the ball home between Neuer's legs.
The Portuguese international's double against Bayern saw him score his 100 European club goal and Zidane revealed Ronaldo was unhappy as he felt he could have added another goal to his name on Wednesday.
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Ancelotti hopes to have striker Robert Lewandowski, who missed the first leg with a bruised shoulder, and defender Mats Hummels, ankle, back for the return.
Ronaldo scored twice in the second half to help Real Madrid come from a goal down and grab the advantage going into the second leg at the Bernabeu.
"We had the game under control in the first-half, but we lost our efficiency after the break. And as he has so much ambition. but in the end we are all happy as it is not easy to get this result here".
The Los Blancos talisman has now scored 97 goals in the Champions League, two in the UEFA Super Cup and one in UEFA Champions League qualification.
Winger Arjen Robben says the Bavarians will have to raise their game having been outplayed in the second half.
Vidal also squandered the chance to put his team 2-0 up before the break after he missed a controversial penalty kick when he blasted the spot-kick over the crossbar and into the stands.
"With patience we got the equaliser at the start of the second half, and from there it was another game".