For Backworlds players, this guide is about how to unlock all achievements in the game, I only get 12 of them, so far but this guide will be updated soon.
Things you need to know
If you think it broke due to a bug, you can reset any level from the game options menu. Go to Options -Game-Reset current level.
I have not find any guide for all levels on Youtube. However, a Chinese player have made one on Bilibili (basically Chinese version of Youtube). Here is the link: https://www.bilibili.com/video/BV1hE411c7Tx?p=1&vd_source=7ae4d8550bc0af6f363dafa7269d4bca.
Part 1: You can’t miss
Happy Accidents
Leave the Cave
Transmog
Find home and use the color changer
The Gamut
Make progress all over the world
The Student
Overcome the head of the forest
The Forgotten
Overcome the spirit at the bottom of the sea
The Socialite
Overcome the airship engine
The Innovator
Overcome the engineer in the city
The Visionary
Reach the end
Part 2: Need practice
Now We Just Need the Compass
Reveal the whole map
Technical Artist
Solve all of the puzzles
Backworlds Done Quick
Reach the ending sequence in less than 60 minutes
Catapedaphobia
Reach the ending sequence before jumping more than 270 times
Part 3: I don’t know | 我也不知道
No Such Thing as a Brontosaurus
Achieve maximum separation of head and body
It Is Not a Cat
Everybody needs a friend
The Michael Solution
Find everything in the forest without using a reset switch
The Ariel Solution
Only teleport once in the engine room
The Cap Solution
Keep the blue flames low when overcoming the spirit