Haaland's goals helped Dortmund secure a 2-2 draw in their second-leg match that sent them into the quarter-finals 5-4 on aggregate.
Haaland has netted 10 times in six Champions League games this season.
For Dortmund the aggregate win secured their first quarter-final spot in four years, with Haaland hungry for more goals.
"It was a hard game -- I'm tired now, but to be in the next round feels very big," Haaland said. "It was a crazy game and a crazy win."
"We knew that they were going to come at us very hard, but when we scored they needed three -- to be 1-0 up at halftime was very good and it was a nice goal."
Haaland's first goal was a tap in from a Marco Reus cutback but his second was a retaken penalty after his first effort was saved.
The penalty was controversially awarded after a lengthy VAR review involving a foul on Haaland minutes earlier.
Haaland has now scored two goals in each of his last four Champions League appearances.
"I missed the first penalty, but if [the keeper] had stood on the line I'd have scored -- like I did with the second. I was a little bit nervous on the second penalty, but I knew it would be nice to score a second goal."