Heads up for those going for this achievement. Do not die during the flying sequence (Either by crashing your plane or getting hit too many times). I know this might seem obvious, but there's an explanation. Getting hit once and restarting your checkpoint is fine, but dying and hitting "Continue" will void your achievement.
Same can be said for "Sneaking Around" in Chapter 4 of Ada's campaign.
EDIT: You can still salvage this achievement after dying by hitting quit instead of continue. After that, select continue from the main menu. By doing this, you will restart from the start of the jet sequence. Credits to Ninja Scroll!
I won't repeat what others have already posted, but all I can say is that it really is as easy as it looks. Just hit RB when you are prompted and you won't go wrong.