First of all, if you're reading this and you want to achieve 100% completion, these are the things you should know:

• 16 out of 29 total achievements are missable. The unmissable ones have been put in a separate section and you don't need to worry about them at all - they are all story related and will unlock themselves as you progress through the game.
  
• You only need to complete the game one time from start to end to unlock all achievements, provided you don't miss anything.
  
• Missable achievements have been listed in the order of unlocking, so if you want to avoid spoilers at all costs, you can read the descriptions one at a time and not miss anything.
  
• The Way doesn't feature manual saving, only a single autosave slot, which can screw you up in a number of ways. If you're anxious about missing an achievement, remember you can always save scum by manually backing up the save file at your leisure. It is located in the following folder:
  
  C:\Users\YourUsername\AppData\Local\The Way\savedata.sav

And that's it! Good luck, have fun and enjoy The Way. :)

Why jump when you can climb?
Climb all the way down a long ladder, without jumping off. You can use either the emergency hatch or the crane chain in the spaceship hangar. You can probably get it at other places too.


Why climb when you can jump?
Analogically Play It Safe, but grab the ladder/chain at the top, then jump down and catch the chain at the very bottom to avoid a fatal fall. You can also probably get it at other places as well.
Reference: Alice in Wonderland


Your head probably hurts like hell...
Jump and hit your head on the ceiling four times in a row or so.


Seems those ground drones have a blind spot
Follow a floor security robot and stand precisely in the middle of where it stops. When it turns around it won't detect you, which will unlock the achievement.


Yup, keep trying... Maybe you'll get lucky next time
As soon as you arrive on the alien planet you can recklessly jump off the cliffs and kill yourself a couple of times in a row to unlock this, but you can probably get it in other places.
Reference: Probably ye olde Polish comic "Przygody Koziołka-Matołka" or "The Adventures of a Billy-Goat Cretin" in English. Get it? Because he's dumb. And a goat. And they jump on cliffs.


Collect all memories
For this achievement you need to find and collect 7 memories of Tom's Love. These look like a ghostly blue apparition of her. You start just as you arrive on it - look at the "Memory Locations" section down below for a list.


Well...That was fast
Solve a puzzle quickly. The only ones that count are those that open up an additional interface that you can close with a red X in upper-right corner. I don't know the exact required time, but you can easily do the first three puzzles in under a minute without much trouble.
Reference: Star Trek


Take your time and do it right
Similar to Quick Witted, but you need to take more than 3 minutes to solve a puzzle without leaving the puzzle screen.
Reference: I can't recall... If you know - please comment! I am 100% sure I've seen that orc/goblin face somewhere, but my memory is confusing it between Gobliiins, Warcraft II peons and The Great Wahooka (or, if you prefer, Wahooka, The Great).


Did you just apparate to the same spot?
Teleport to the exact same place where you're standing (which basically means clicking twice).
Reference: Harry Potter


...but the explosion killed me
Get yourself killed by trying to block a grenade launcher droid's projectile with your Shield.
Reference: Silver Surfer


It fits but it doesn't work
In the East Generator, when you assemble the rail from 5 pieces, you must do it in a specific, incorrect way. You can unfortunately lock yourself out of the achievement if you accidentaly solve the puzzle correctly, so you might wanna save scum for this. This is generally horrible, because the elements blend with the brackground too much. If you want a direct solution, look at this screenshot by kalizmocho, who kindly posted it in the forums:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=786513610
Try to assemble the pieces in this exact order. Tom will comment on it in red font and the achievement should pop.


Bounce, bounce, bounce...
On your way to the West Generator, you're going to be attacked with fireballs. You need to use your Shield at a specific angle, depending on the distance between you and the attacker, and bounce the same fireball on it three times in a row. It's tricky, but certainly doable. It doesn't really have to never hit the ground, just bouncing it three times should suffice. If you accidentaly bounce the fireball to your attackers and kill them, just restart before you progress further. As an alternative - you also encounter fireballs in the South Generator as a deadly puzzle element and you could try unlocking this achievement there. The angles there make bouncing a lot easier. Confirmed to be working:

引用自 Sporefreak：

Can confirm the "Never hit the ground" achievement works in the south generator.

Reference: Singin' in the Rain


You can't brute force the steam vents...
In the South Generator you will encounter some deadly steam vents that you need to figure out how to get through (there's a pattern you need to follow). Just kill yourself repeatedly on them as soon as you see them and the achievement should pop.
Reference: The Hangover


Beat the Boss...Without dying even once.
Don't die during the boss "fight" at the end. No need to save scum for this - after finishing the game you can select "Continue" and it will load exactly at the beginning on the boss fight and you can attempt this again. You'll have to do that either way to get the two ending achievements. If you still failed, remember that after dying once you can just close the game and load it again. Apparently this last fight was severely nerfed after player complaints, but it doesn't make much sense either way and move speed is pretty much infuriating. I'm afraid there's not much advice that can be given here, as navigating a bullet hell is more skill-based than informative. Fortunately your hitbox is quite small, about the size of the bright white pixels in the center of the light that you get to control.
Reference: DOOM



You get these for choosing each of the two endings at the very end. No need to save scum - if you didn't get the other one yet, just select "Continue" after watching the post-credits scene, beat the boss again and choose the other one this time.

Set your plan in motion


Get a gun
Reference: Scarface


Land on an alien planet
Reference: David Bowie


Kill the nope
Reference: a normie meme


Unlock shield mode
Reference: Daft Punk / TRON


Unlock teleportation mode
Reference: Daft Punk / TRON


Unlock telekinesis mode
Reference: Daft Punk / TRON


He's after you!


Find the place mentioned by an alien map


Bring a gift of water to locals


Find an alien city
Reference: X-Files


Dig a very long tunnel
Reference:


Beat the Boss
Reference: Choice of Black Forest cake strongly suggests Portal

To the left of the space ship when you arrive on the alien planet:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1564640487

At the Temple of Life, right after climbing down from the waterfall jumping puzzle segment, under the leftmost waterfall:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1564640698

In the village, high in the trees, to the right of the entrance to the ruined chamber (visible from the ground):
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1564640779

In the Mind Barrier temple, just after the Simon Sez puzzle, to the right of an Access panel you need to use to progress, very hard to miss:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1564640882

After you find yourself in the desert, go left. You will encounter a hole in the ground, descending into an entrance to a huge subterranean ruin with large round pillars. The memory is on the right edge of that place:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1564640935

You will encounter it on your way to the West Generator. It's in a hole in the ground, difficult to miss:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1564641039

At the end of the Journey, it's in the middle of the tunnel you're digging. Impossible to miss:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1564641154