lightsup55 has just submitted some Achievement Flag Info for
Perfect Dark Achievements:
lightsup55 said:Buggy +
The actual achievement's requirements say that you need to complete Challenge 1-29 but will unlock after having completed challenges marked by a star based on the player count.
So you could essentially
- complete Challenge 1 solo
- complete Challenge 1 with 2 players
- complete Challenge 1 with 3 players
- complete Challenge 1 with 4 players
And you'll have 4 stars next to Challenge 1. This counts as 4 challenges completed. You can keep doing this with each of the earlier and easier challenges until you get to challenge 8 to leave you with slightly more than 29 stars.
The only problem with this method is that the achievement doesn't pop right away. However, if the player were to quit the game (completely exit and stop the game from running; especially if playing via backward compatibility on Xbox One), loaded the game back up, chose "Play Game" from the main menu, this achievement will unlock under the conditions I've mentioned above.
All of this is mentioned in the achievement's top guide posted by
Dr Lipschitz.