The striker bagged both goals as Ireland beat the Faroe Islands 2-0 in the World Cup qualifier at Lansdowne Road to forge ahead of previous record holder Niall Quinn.
Level with Quinn at kick-off, Keano took just 14 minutes to set the new mark via the penalty spot and doubled his tally before the break to move on to 23 goals in 56 caps at the tender age of 24.
"I'm very pleased, delighted - it's a dream come true for me," said a delighted Robbie.
"Ever since I was a kid I always wanted to score goals for Ireland and to play for my country and now to be Ireland's leading goalscorer is a dream come true.
"But the most important thing was that we got the three points after the good result against France on Saturday.
"It could have been more than 2-0, we had the chances but that happens in football."
Robbie Keane declared it a 'dream come true' after becoming the Republic of Ireland's all-time record goalscorer last night.