This game has pissed me off more than ever now! I've been swindled out of the 100G achievement for completing all 5 cases
It lookslike my gamesave glitched on Case 2 as its greyed out and I'm not able to replay it. I was able to complete Case 2 got the cheevo for it, but when I got to finish Case 5 the 100G didn't unlock. Had to delete my gamesave and then replay from the start again. Skipping the dialog (RB) is a massive help and cheers for whoever posted that tip.
Be warned. If the game reports an error with your gamesave you could be screwed like I was and have to replay again.