Achieve360points.com has the list up for the Orange Box compilation:
This is what I want to see more of in Achievement design. Many of these are well-thought-out, encourage players to strive for additional challenge or alternate ways to play the game, and look to include all the games that are part of the package.
Love these in particular:
22. Targetted Advertising
Pin a soldier to the billboard in chapter Highway 17..
24. Keep Off the Sand!
Cross the antlion beach in chapter Sandtraps without touching the sand..
Contain the Citadel core without killing any stalkers..
43. The One Free Bullet
Beat Episode One firing exactly one bullet. Grenade, crowbar, rocket, and Gravgun kills are okay!.
71. Master of Disguise
Trick an opposing medic into healing you..