- What is the estimated achievement difficulty for GRIS?
The estimated achievement difficulty for GRIS is 2/10.
- How many offline achievements are there in GRIS?
There are 17 offline achievements in GRIS.
- How many online achievements are there in GRIS?
There are 0 online achievements in GRIS.
- How long does it take to get 100% in GRIS?
The estimated time to get 100% in GRIS is 4-6 hours.
- How many playthroughs is needed to get 100% in GRIS?
- How many missable achievements are there in GRIS?
There are no missable achievements in GRIS.
- Does difficulty affect achievements in GRIS?
Difficulty does not affect achievements in GRIS.
- Are there any unobtainable/glitched achievements in GRIS?
There are no unobtainable/glitched achievements in GRIS.
- Estimated achievement difficulty: 2/10 [Achievement Difficulty Rating]
- Offline: 17 
- Online: 0
- Approximate amount of time to 1000: 4-6 hours [Estimated Time to 100%]
- Minimum number of playthroughs needed: 1
- Missable achievements: None [chapter select]
- Does difficulty affect achievements: No difficulty option
- Unobtainable/glitched achievements: None
Welcome to GRIS, an extremely atmospheric and artist platformer with some very minor puzzle elements. There's a heavy focus on the soundtrack, the art style, and the mood of the game, and it has no enemies, no ways to die, etc., making it a very casual and enjoyable experience from start to finish. There are a bunch of collectibles throughout the game but none are complicated to get, and then a handful of miscellaneous achievements. Thanks to a great setup for chapter select, anything can be mopped up after the completion (and quite efficiently too), so if you just want to go in blind for your playthrough, go for it. Let's get started.
As noted above, there are collectibles and miscellaneous achievements throughout this game. There is one overarching collectible, Mementos, that are scattered across all chapters of the game. Then, there are a few chapter-specific collectibles. Lastly, each chapter has a miscellaneous achievement in it. For the Mementos, there are a ton of text guides out there, but honestly, I found them all pretty hard to follow, and I ended up missing a bunch. A video guide is far more useful, and I've linked one in Mementos (55G).
For the chapter-specific collectibles and miscellaneous achievements, here is the breakdown, allowing you to jump to each as you get to each chapter:
Magic fowls (55G)
Childhood (120G) (requires you to have collected all Mementos)
If you follow along with the guide, by the time you beat the game/finish Chapter 6, you should have the full completion. If you missed any collectibles, see below for chapter select.
If you missed any collectibles or miscellaneous achievements, you can use Chapter Select but only after beating the game. Once you've beaten the game, select Continue from the main menu to load up your game. Then, pause and choose the new bottom option, Chapters. This not only lets you choose a chapter to replay, but it gives you three checkpoints to start from in each chapter, making it much more efficient to mop up any collectibles you're missing. In Mementos (55G). not only is there a video showing the location of all of these collectibles, but I've also listed out underneath the video which checkpoint to load into for each collectible, in case you missed one and need to replay part of a chapter.
GRIS is a beautiful game and a really enjoyable experience. The art style is really nice, the soundtrack is so good while playing through the game, and there's really no stress throughout the playthrough. While a guide is useful for limiting this to only one playthrough, it's definitely worth just playing through the game without any help as much as possible, just to enjoy the experience. Congrats on the completion!