Here are some career milestones that we might see from the Celtics this year, and some estimations for when they could happen. If you guys think you might want to check it every now and then (I plan to update it regularly) maybe a mod could make it a sticky, although I know there are several already.
Paul PiercePoints - 18,146
Milestone: 17,000 -
Milestone ReachedMilestone: 18,000 -
Milestone Reached*Milestone: 17,336 -
Milestone Reached - Pierce passes McHale for Celtics 4th scorer all time*Milestone: 18,246 (to pass Parish for 3rd all time in Celtics scoring) - 100 away, 5 games
Rebounds - 4,992
Milestone: 5,000 - 8 away, 1-2 games
Assists - 3,113
Milestone: 3,000 -
Milestone ReachedNotes - Only 23 players in history have accomplished at least 18,000-5,000-3,000.
Kevin GarnettPoints - 21,241
Milestone: 21,000 -
Milestone ReachedRebounds - 11,664
Milestone: 12,000 - 419 away, 46 games (early next season)
Assists - 4,530
Milestone: 4,500 -
Milestone ReachedMilestone: 5,000 - 470 away, ~160 games... he has slowed here the most, mid 2010-2011 season, knock on wood
Blocks - 1,730
Milestone: 1,700 -
Milestone ReachedMilestone: 2,000 - 270 away, ~185 games, late 2010-2011 season, knock on wood
Steals - 1,443
Milestone: 1,500 - 57 away, early next season
Notes - Technically, 0 players in NBA history have the minimums in these 5 (or for what KG has now for that matter), although Kareem may have reached the 1,500 steals if they were counted his first 4 years. For just the PTS-REB-AST numbers, 3 others in history - Kareem, Malone, Wilt.
Ray AllenPoints - 19,330
Milestone: 19,000 -
Milestone ReachedRebounds - 4,106
Milestone: 4,000 -
Milestone ReachedAssists - 3,496
Milestone: 3,500 - 4 away, 1 games
3PT FG Made - 2,250
Milestone: 2,250 -
Milestone ReachedMilestone: 2,561 (to pass Reggie Miller for most 3 PT made in NBA History) - 311 away, 150 games away (early 2010-2011 season)
Notes - Only Reggie Miller has as many 3PT FGs and PTS-REB-AST. Take out the 3 pointers and only 20 others have done it.
Rajon RondoPoints - 2,014
Milestone: 2,000 -
Milestone ReachedAssists: 1,200
Milestone: 1,000 -
Milestone Reached
Rebounds: 935
Milestone: 1,000 - 65 away, 12 games
Steals: 374
Milestone: 400, 26 away, 13 games
Notes - Well... 2,000-1,000-1,000 would not be the most exclusive club, but I think Rondo could be in elite company with his all around PTS-REB-AST-STL numbers in about 10 years.
Kendrick PerkinsPoints - 1,812
Milestone: 2,000 - 188 away, 25 games
Rebounds - 1,872
Milestone: 2,000 - 128 away, 14 games
Pretty amazing to think the Celtic's have 3 players, still producing, that could soon each be among the top 25 or so players in terms of career statistical production. (Oh, and they've got a ring, to boot

). Also, KG has a legitimate chance of becoming the new gold standard for all around production, although I don't think he surpasses Kareem or Malone in that status unless he plays a good 5-7 more years.
Oh, and one more...
Boston CelticsNBA Championships - 17
Milestone: 18 - 1 away, estimated 1 season away
[updated through Game 60]