The Orange Box Achievements

The Orange Box Xbox 360 version sets the record for the most achievements of any Xbox 360 game with 99 of them!

Some are exclusive to the Xbox 360 version and can not be accessed on PC: Half-Life 2 and Episode One. Episode Two and Portal can be done on the PC with achievements, though.

Any Half-Life 2 game
There are 6 achievements worth a total of 40 gamerpoints shared by the 3 Half-Life 2 games in The Orange Box.

Half-Life 2
Half-Life 2 has 32 achievements with 275 gamerpoints unique to it.

Episode One
Half-Life 2: Episode One has 12 unique achievements worth 135 gamerpoints.

Episode Two
There are 22 achievements in Episode Two. All these achievements need pictures.

Portal
Portal has 14 achievements worth 175 gamerpoints.

Team Fortress 2
Team Fortress 2 has 17 achievements worth 170 gamerpoints.