"Achtung Baby" is one of U2's most successful records; it received favourable reviews and debuted at number one on the US "Billboard" 200 Top Albums, while topping the charts in many other countries. Five songs were released as commercial singles, all of which were chart successes, including "One", "Mysterious Ways", and "The Fly". The album has sold 18 million copies worldwide and won a Grammy Award in 1993 for Best Rock Performance by a Duo or Group with Vocal. "Achtung Baby" has since been acclaimed by writers and music critics as one of the greatest albums of all time. The record was reissued in October 2011 to commemorate the 20th anniversary of its original release.