If this is true and the descriptions of Game Pass achievements can't be changed like normal xbox achievements can (which I have to admit I doubt would be true!) could you not change the game's unlock requirements to make them unlock upon say starting your first game and winning your first match?
The names and descriptions of the achievements wouldn't make sense to the unlock requirements but at least you wouldn't have a game that cannot be completed.
On the Xbox Live platform there are definitely a subset of players (small it may be) that won't play a game that cannot be completed, this would cater to those potential players.