- Your HUD might not support the file
- Your HUD might support the file, but move the entire element off screen (It is possible to put a HUD crosshair in the file and because it has a toggle command you can then toggle a HUD crosshair through commands. Useful for things like crosshair switch scripts. It's an ancient HUD trick from before VTF crosshairs became the norm)
- You don't have the command to make the tracker show up set to 1
edit: hud_achievement_tracker 1 in case anyone ever comes across this thread with the same question. Didn't want to bump the thread so I PM'd it to sp00ky
edit2: the command was the issue