Garnett entered the night six points shy of the milestone. He went to the bench scoreless after picking up two fouls in the first 2:08. Garnett hit a long jumper to start the second quarter, then registered a putback. He reached 25,000 points with a turnaround fadeaway with 8:08 to play in the second quarter.
The Celtics acknowledged the milestone during the next stoppage in play and the crowd gave Garnett a standing ovation, which he acknowledged by waving to the fans.
Garnett finished with 15 points in the Celtics' 116-95 win.
Garnett joins an exclusive club of players with at least 25,000 points that includes Kareem Abdul-Jabbar (38,387), Karl Malone (36,928), Michael Jordan (32,292), Wilt Chamberlain (31,419), Kobe Bryant (30,834), Shaquille O'Neal (28,596), Moses Malone (27,409), Elvin Hayes (27,313), Hakeem Olajuwon (26,946), Oscar Robertson (26,710), Dominique Wilkins (26,668), John Havlicek (26,395), Alex English (25,613), Reggie Miller (25,279) and Jerry West (25,192).
Last month, after passing Patrick Ewing for 16th place on the all-time scoring list, Garnett downplayed the accomplishment.
"I guess when you've been in the league as long as I've been in it you want to accomplish some things," Garnett said. "Nothing more, nothing special in it. I guess some day it'll mean something to me. But at this point, it's relative. I'm sorry to be kind of, you know ... I'm not into the individual stuff, but obviously I've accomplished some things in this league, so that's a good thing."