While this achievement doesn't require you to complete the game game without skipping any sequences, there are achievements throughout the game which do require that so it's a good idea to go for them all in one go rather then skipping sequences on one playthrough and then having to complete the game again without skipping sequences, To better explain what sequences are, the entire game is set up somewhat like a movie and it gives you the option of fast-forwarding through sections of the game, however as I said, there are achievements for completing each chapter of without skipping any sequences.
The game consists of 8 chapters, rather then provide a breakdown of every level and what do do, I'll provide a link to a solution for each level, here;
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Solution for BLACKOUT In Alone In The Dark (2008)•
Solution for QUESTIONS In Alone In The Dark (2008)•
Solution for PAINFUL ANSWERS In Alone In The Dark (2008)•
Solution for FIGHT BACK AND LOSS In Alone In The Dark (2008)•
Solution for NOT ALONE ANYMORE In Alone In The Dark (2008)•
Solution for THE TRUTH In Alone In The Dark (2008)•
Solution for THE PATH OF LIGHT In Alone In The Dark (2008)•
Solution for THE LIGHT BRINGER In Alone In The Dark (2008)Those links are in the same order as the games chapters!