Background: Sakic was born in Burnaby, British Columbia, to Marijan and Slavica Sakic (originally Sakic, Croatian pronunciation: [Sakitc]), immigrants from Croatia in what was then Yugoslavia. Growing up in Burnaby, he did not learn to speak English well until kindergarten, having been raised with Croatian as his mother tongue. At the age of four, Sakic attended his first NHL game, a match between the Vancouver Canucks and Atlanta Flames; after watching the game, Sakic decided that he wanted to become a hockey player. As a smaller player, he was forced to use skill rather than size to excel, and modeled himself after his idol, Wayne Gretzky.
Context: Sakic recorded his 1,000th career point on December 27, 1999, against the St. Louis Blues. He became the 11th player to reach 1,500 points, doing so on October 25, 2006, with an assist against the Washington Capitals, and the sixth to do so with one franchise. Gordie Howe, Wayne Gretzky, Mario Lemieux, Raymond Bourque and Steve Yzerman are the others who have achieved this feat. On March 22, 2008, Sakic notched his 1,000th career assist against the Edmonton Oilers on a second period goal scored by Tyler Arnason.  Sakic played his 1,000th career game on March 9, 2002, against the Los Angeles Kings. His 500th career goal came against the Vancouver Canucks on December 11, 2002. In a February 15, 2007, game against the Calgary Flames, Sakic scored his 600th career goal. He also earned his 900th assist, the 16th player to do so, against the Flames in a game on March 12, 2006.  During the final game of the 2006-07 season, Sakic scored his 100th point of the year. This made him, at age 37, the second oldest player in NHL history, after Gordie Howe, to record 100 points in a regular season. He became the longest active tenured captain in the league, with fifteen seasons leading the Nordiques/Avalanche franchise, after the retirement of Steve Yzerman at the conclusion of the 2005-06 regular season. On March 22, 2008, against the Edmonton Oilers, Sakic recorded the 1,000th assist of his career, the 11th player to do so. The gloves he wore in the game were later sent to the Hockey Hall of Fame.  Alongside Bobby Clarke, Wayne Gretzky and Mark Messier, Sakic is one of four players to captain his team to a Stanley Cup championship and win the Hart Memorial Trophy in the same year. Sakic is also a member of the Triple Gold Club, a term used in ice hockey to describe players who have won an Olympic Gold medal, a World Championship Gold medal and the Stanley Cup.
Question: What was his first milestone?

Answer:
Sakic recorded his 1,000th career point on December 27, 1999, against the St. Louis Blues.