- Estimated achievement difficulty: 3/10 [Achievement Difficulty Rating]
- Offline: 33 [1000

- Approximate amount of time to 1000

- Minimum number of playthroughs needed: 1
- Missable achievements: No
- Does difficulty affect achievements: N/A
- Unobtainable/glitched achievements: No
Introduction:
I'd suggest following along with the Neoseeker walkthrough HERE as you play, which will point out all of the above required extras. It also points out literally every chests and anything else that could be considered "missable" in the game, but again nothing in the game that can be missed is required for an achievement, so don't stress too much about any of it.
The starting character you choose does not matter, but make sure you play through Chapter 1 of every new character you recruit since it is required for their respective completion achievements and you'll need to visit those locations for another achievement as well. It will also help keep all your characters evenly leveled and fill in the story properly. Do take note that Osvald is a unique character in that he launches directly into his Chapter 2 story after completing Chapter 1, while every other character will need to travel to a different town to continue their stories. If for any reason you skip a Chapter 1 story or decide to ignore any future chapter story when first arriving in a town, they can all be started later from the respective town's Tavern.
Regardless of how what order you choose to tackle the story, work on collecting all eight travelers first, then the game can be played in a more linear fashion, though you'll need to swap out party members to take part in their stories. Once you complete the game, mop up any side-quests or collectibles you have left to finish up the rest of the achievements before tackling the game's superboss to get the full completion!
Conclusion: