Here is the full list of all 20 Shadow Fear Path to Insanity achievements.
You finished the first chapter of the game...
You finished chapter II...
Keep going! You finished chapter III...
You completed the fourth chapter of the game...
Chapter V is now complete...
Finally, no more creepy school hallway, you finished chapter VI...
Chapter VII is now from the past, keep going, sun will rise soon...
You see the sun beginning rising, you survived the night, congratulation...
You can now defend yourself and show them zombies who's the boss...
You obtained the first major key of the game...
You obtained 10 golden coins...
You found 25 out of the 50 golden coins, keep searching...
You are a beast! You collected the 50 hidden gold coins of the game...
You injected yourself the adrenaline upgrading your speed permanently...
You killed 50 monsters... Great!
You killed 100 monsters... You don't like them or what?
You don't mess around with monsters it seem, you killed 150 of them!!!
You found and readed all note and documents in the game, lore!!!
You are now ready to kill the final boss i guess... Just do it!
You unlocked the infinit ammo upgrade using the first tombstone...