To earn this achievement, "The tale from start to end", you must complete the storyline for this game.
The way I got the achievement was simple. After you get acquianted with the game and how it works, you'll be put into Elvenguard, the first town. You will find residents there and they will ask you to complete quests in dungeons, such as fetching a certain amount of a specific item or, in some cases, finding one item (usually found when you destroy the boss of that dungeon), killing a certain number of enemies or even the boss. It's quests like those that you must accept and then complete. As you complete them, harder difficulties of those dungeons will unlock. You will have to return to those dungeons and complete them on a higher setting, along with completing those quests that you keep getting.
So, what I'm saying is this; find all the quests, complete them, not to mention going through the dungeons on those harder settings. When you reach the final dungeon, which is the Sealed Temple, you are asked to defeat the last boss, on Normal. Accept the quest, go through it with a friend or by yourself, it doesn't matter. Once you destroy the final boss and witness the ending, speak to the Angelis that's waiting for you (the one that's near Loton) and the achievement should unlock right then and there!
Have fun and good luck!
Edit: Here's a tip from Crimson Drifter in regards to getting this achievement:
You do not need to beat the dungeons at higher difficulties, albeit playing them on harder difficulties will net you more money/ better loot, it is not necessary. You can play through only playing Normal and get this achievement. The game does require you though to replay missions to fulfill quest requirements to move forward, but not at a higher difficulty.
Thanks to Crimson Drifter for the heads-up!