Just wanted to comment that when using RT to skip none of the options make any difference. The options seem to only affect Auto Mode which is started by pressing LB+RB, but even at High Speed setting,the skip speed is too slow compared to using RT, so it is not advised.
There's only 3 choices in the whole game, and the rest is just matter of holding down RT. All 3 towards the first 1/3 of the game. So, you may want to note that after making those 3 choices, you can go away and come back after about an hour or so to find all achievements unlocked except for the two that require to enter the menus in PREMIUM.