Title says it all really, I was in the middle of buying vehicles when my game crashed, launched the game again and now the progress for the achievement doesn't update past 88%
I'm really close to unlocking all the achievements so i'd rather not have this glitched permanently.
I'm sorry to hear this has occurred, Orquita
The first thing we'd advise is power cycling the console, to clear the cache. Sometimes crashes can cause corruptions in the cache and clearing the cache can resolve this. You can do this by turning off the console, unplugging it, waiting a minute, plugging it back in and turning it on again.