Achievements Disappear in Portal (Xbox 360)
When playing advanced maps in Portal, some of my achievements disappear. Why does this happen and how can I fix it?
This issue occurs specifically when you do the following:
- Beat an advanced map.
- Load up another advanced map, and save the game.
- Quit the game.
- Start up again, and load your save without looking at the new game menu.
- Beat the advanced map you loaded.
To resolve this issue:
- Start the game, open the new game menu.
- Select an advanced chamber (any one) and complete it.