- Offline: 22 
- Online: 0
- Approximate amount of time to 1000: 60-75 hours
- Minimum number of playthroughs needed: 2
- Number of missable achievements: 1 ["Score Piece Collector"]
- Glitched achievements: None!
- Do cheat codes disable achievements: No Cheats
Welcome to Eternal Sonata. This game has a total of 22 achievements and requires two playthroughs to get 1000. Of the achievements 12 are unlocked simply by playing through the story. The remaining achievements require you to either collect certain items or clear out an optional dungeon.
Before you begin it is a good idea to find a walkthrough to follow. Even if you don't follow it word for word, it will most likely get you out of a bind if you find yourself in a situation where you don't know what to do. I personally found this walkthrough to be particularly helpful. In addition to the walkthrough you will find the following links helpful too:
Fort Fermata Map
Mysterious Unison Maps
Score Piece Guide
For this playthrough, your goal should be to do everything you possibly can. This means collecting every available score piece and completing the Mysterious Unison dungeon. Also, you should do your best to collect the score pieces in the order the guide lists them. The reason being that the game does not actually number the pieces, so of you collect them out of order you will find it difficult to play the correct piece to get EZI pieces. However, do not worry about collecting EZI pieces on this playthrough as you can't get them all yet and they will disappear for the next playthrough. Also, be advised that this game has A LOT of long cut scenes. As such, you will have to wait until you have control of your party again for the "party level" and "chapter" achievements to unlock.
Make sure you follow the clues to unlock the Pirate Dolce fights for this playthrough so you can get the score piece and Werewolf Choker (3 fights in this playthrough). Last, if you're wondering when you can do enter Mysterious Unison, you can go into it right after you kill the boss at the top of the Double Reed Tower of Sand. If you enter the portal after beating this boss you cannot go back.
For this playthrough, also known as "The Encore," enemies will have more health, better defense and better attacks. You will also only keep your score pieces, party levels and the Hero's Crest from your previous playthrough. Hopefully you followed the advice above and cleared out Mysterious Unison already. Last, you technically don't have to beat the game on this playthrough, but you will have to play to Chapter 7 and beat the Xylophone Tower.
With all of that covered, we can now go over what you need to do on this playthrough. This time around, you'll want to collect all of the EZI pieces. EZI pieces themselves are worthless items, but are needed for a large point achievement. You'll also want to follow the trading sequence to get the glowing orb. This will allow you to access the treasure atop Xylophone Tower. Again, also make sure that you do th Pirate Dolce fights for this playthrough too (4 fights in this playthrough). Last you'll want to mop up the rest of the score pieces (again, trying to get them in guide order).
At this point, if you are still missing an achievement, I suggest you load up a previous save. If you somehow still missed score piece 31, make sure the save you load up is an encore save.