I’m a month late for posting this. Got the platinum trophy for Escha & Logy after playing for a month.
As most people has suggested, Escha and Logy can be considered as one of the easiest PS3 Atelier game to date. As events (icons) are easily spoon-feed and shown to players once the required amount of friendship between characters are gained, endings are hard to miss. The 6-man party and double draw system are also easy to abuse once decently crafted endgame items are made, making almost all battles, with the exception of 2-3 bosses are easily beatable with ease.
Getting to 100% required two playthroughs, one for Escha, and another for Logy as the true ending can only be seen on 2nd playthrough onwards. Level 99 is also another requirement, but thanks to the DLC dungeon, reaching max level isn’t as difficult as it used to be.
Defeating the fully powered-up final boss, however, is probably the hardest requirement in the game. I think I took around a dozen tries or so before defeating her with my gears and stuffs.